Complete pixelwise frame/window resizing, add horizontal scrollbar support.

* frame.el (frame-notice-user-settings): Rewrite using
frame-initial-frame-tool-bar-height.
* menu-bar.el (menu-bar-horizontal-scroll-bar)
(menu-bar-no-horizontal-scroll-bar): New functions.
(menu-bar-showhide-scroll-bar-menu): Add bindings for horizontal
scroll bars.
* scroll-bar.el (scroll-bar-lines)
(set-horizontal-scroll-bar-mode)
(get-horizontal-scroll-bar-mode, horizontal-scroll-bar-mode)
(scroll-bar-horizontal-drag-1, scroll-bar-horizontal-drag)
(scroll-bar-toolkit-horizontal-scroll): New functions.
(horizontal-scroll-bar-mode)
(previous-horizontal-scroll-bar-mode)
(horizontal-scroll-bar-mode-explicit): New variables.
(horizontal-scroll-bar-mode): New option.
(toggle-horizontal-scroll-bar): Do something.
(top-level): Bind horizontal-scroll-bar mouse-1.
* startup.el (tool-bar-originally-present): Remove variable.
(command-line): Don't set tool-bar-originally-present.
* window.el (window-min-height): Update doc-string.
(window--dump-frame): Dump horizontal scroll bar values.
(window--min-size-1): Handle minibuffer window separately.
Count in margins and horizontal scroll bar.  Return safe value
iff IGNORE equals 'safe.
(frame-windows-min-size): New function (used by frame resizing
routines).
(fit-frame-to-buffer, fit-window-to-buffer): Count in horizontal
scroll bars.
(window--sanitize-window-sizes): New function.
(window-split-min-size): Remove.
(split-window): Count divider-width.  Don't use
`window-split-min-size' any more.  Reword error messages.
Sanitize windows sizes after splitting.
* buffer.h (struct buffer): New fields scroll_bar_height and
horizontal_scroll_bar_type.
* buffer.c (bset_scroll_bar_height)
(bset_horizontal_scroll_bar_type): New functions.
(Fbuffer_swap_text): Handle old_pointm field.
(init_buffer_once): Set defaults for scroll_bar_height and
horizontal_scroll_bar_type.
(syms_of_buffer): New variables scroll_bar_height and
horizontal_scroll_bar_type.
* dispextern.h (window_part): Rename ON_SCROLL_BAR to
ON_VERTICAL_SCROLL_BAR.  Add ON_HORIZONTAL_SCROLL_BAR.
(set_vertical_scroll_bar): Remove prototype.
(x_change_tool_bar_height): Add prototype.
* dispnew.c (adjust_frame_glyphs_for_frame_redisplay)
(window_to_frame_vpos, update_frame_1, scrolling, init_display):
Use FRAME_TOTAL_COLS and FRAME_TOTAL_LINES instead of FRAME_COLS
and FRAME_LINES.
(adjust_frame_glyphs_for_window_redisplay): Rearrange lines.
(update_window): Start mode_line_row->y after horizontal scroll
bar.
(change_frame_size_1): Call adjust_frame_size.
(init_display): When changing the size of a tty frame do not
pass height of menu bar.
(Qframe_windows_min_size): New symbol.
* frame.h (struct frame): List tool bar fields after menu bar
fields.  Add official, total_lines, horizontal_scroll_bars,
config_scroll_bar_height and config_scroll_bar_lines fields.
(FRAME_HAS_HORIZONTAL_SCROLL_BARS)
(FRAME_CONFIG_SCROLL_BAR_HEIGHT, FRAME_CONFIG_SCROLL_BAR_LINES)
(FRAME_SCROLL_BAR_AREA_HEIGHT, FRAME_SCROLL_BAR_COLS)
(FRAME_SCROLL_BAR_LINES, FRAME_TOTAL_LINES, SET_FRAME_LINES)
(FRAME_WINDOWS_HEIGHT): New macros.
(SET_FRAME_HEIGHT, FRAME_TEXT_LINES_TO_PIXEL_HEIGHT)
(FRAME_PIXEL_Y_TO_LINE, FRAME_PIXEL_HEIGHT_TO_TEXT_LINES)
(FRAME_TEXT_TO_PIXEL_HEIGHT): Separately count top margin and
horizontal scroll bar.
(frame_inhibit_resize, adjust_frame_size)
(frame_windows_min_size): Add declarations.
(Qscroll_bar_height, Qhorizontal_scroll_bars)
(x_set_scroll_bar_default_height, x_set_left_fringe)
(x_set_right_fringe, x_set_vertical_scroll_bars)
(x_set_horizontal_scroll_bars, x_set_scroll_bar_width)
(x_set_scroll_bar_height): Add external declarations.
* frame.c: (frame_inhibit_resize, frame_windows_min_size)
(adjust_frame_size): New functions.
(make_frame): Initial horizontal_scroll_bars field.  Use
SET_FRAME_LINES.  Don't allow horizontal scroll bar in
minibuffer window.
(make_initial_frame, make_terminal_frame): No horizontal scroll
bar in initial and terminal frames.  Use adjust_frame_size.
(Fframe_total_cols): Fix doc-string.
(Fframe_total_lines, Fscroll_bar_height): New Lisp functions.
(Fset_frame_height, Fset_frame_width, Fset_frame_size): Rewrite
using adjust_frame_size.
(Qscroll_bar_height, Qhorizontal_scroll_bars)
(Qframe_windows_min_size): New symbols.
(x_set_frame_parameters): Remove call of check_frame_size.
(x_report_frame_params): Return scroll_bar_height value.
(x_set_left_fringe, x_set_right_fringe): New functions.
(adjust_frame_height, x_set_internal_border_width)
(x_set_fringe_width): Remove.
(x_set_internal_border_width, x_set_vertical_scroll_bars)
(x_set_scroll_bar_width, x_set_right_divider_width)
(x_set_bottom_divider_width): Rewrite using adjust_frame_size.
(x_set_horizontal_scroll_bars, x_set_scroll_bar_height): New
functions.
(x_figure_window_size): Rewrite to make frame display the
expected number of lines.
(Vdefault_frame_scroll_bars): Rewrite doc-string.
(Vdefault_frame_horizontal_scroll_bars)
(Vframe_initial_frame_tool_bar_height)
(frame_inhibit_implied_resize): New variables.
* fringe.c (compute_fringe_widths): Remove.
* gtkutil.h (YG_SB_MIN, YG_SB_MAX, YG_SB_RANGE): Define.
(xg_create_horizontal_scroll_bar)
(xg_update_horizontal_scrollbar_pos)
(xg_set_toolkit_horizontal_scroll_bar_thumb)
(xg_get_default_scrollbar_height)
(xg_clear_under_internal_border): Extern.
* gtkutil.c (xg_frame_resized): Don't call
do_pending_window_change.
(xg_frame_set_char_size): Use adjust_frame_size.
(style_changed_cb): Call update_theme_scrollbar_height and
x_set_scroll_bar_default_height.
(x_wm_set_size_hint): Don't call check_frame_size.
(update_theme_scrollbar_height)
(xg_get_default_scrollbar_height)
(xg_create_horizontal_scroll_bar)
(xg_update_horizontal_scrollbar_pos)
(xg_set_toolkit_horizontal_scroll_bar_thumb): New functions.
(xg_create_scroll_bar): Set horizontal slot of bar.
(xg_initialize): Call update_theme_scrollbar_height.
(xg_clear_under_internal_border): No more static.
* insdel.c (adjust_suspend_auto_hscroll): New function.
(adjust_markers_for_delete, adjust_markers_for_insert)
(adjust_markers_for_replace): Call adjust_suspend_auto_hscroll.
* keyboard.c (readable_events, discard_mouse_events)
(make_lispy_event): Handle horizontal scroll bar click events.
(Fsuspend_emacs): When changing the size of a tty frame do not
pass height of menu bar.
(Qbefore_handle, Qhorizontal_handle, Qafter_handle, Qleft)
(Qright, Qleftmost, Qrightmost): New symbols.
* menu.c (Fx_popup_dialog): Use FRAME_TOTAL_LINES instead of
FRAME_LINES.
* minibuf.c (read_minibuf): Initialize suspend_auto_hscroll.
* nsfns.m (x_set_internal_border_width): New function.
* nsterm.m (ns_draw_fringe_bitmap, ns_set_vertical_scroll_bar):
Remove extended fringe code.
(x_set_window_size, x_new_font): Don't call
compute_fringe_widths.
* term.c (Fresume_tty): When changing the size of a tty frame do
not pass height of menu bar.
(clear_tty_hooks, set_tty_hooks): Clear
horizontal_scroll_bar_hook.
(init_tty): Frame has no horizontal scroll bars.
* termhooks.h (enum scroll_bar_part): Add scroll_bar_move_ratio,
scroll_bar_before_handle, scroll_bar_horizontal_handle,
scroll_bar_after_handle, scroll_bar_left_arrow,
scroll_bar_right_arrow, scroll_bar_to_leftmost and
scroll_bar_to_rightmost entries.
(enum event_kind): Add HORIZONTAL_SCROLL_BAR_CLICK_EVENT
(struct terminal): Add set_horizontal_scroll_bar_hook.
* w32console.c (initialize_w32_display): Clear
horizontal_scroll_bar_hook.
* w32fns.c (x_set_mouse_color): Use FRAME_W32_DISPLAY instead of
FRAME_X_DISPLAY.
(x_clear_under_internal_border, x_set_internal_border_width):
New functions.
(x_set_menu_bar_lines): Rewrite using frame_inhibit_resize.  Set
windows_or_buffers_changed when adding the menu bar.
(x_set_tool_bar_lines): Rewrite using adjust_frame_size.
(x_change_tool_bar_height, x_set_scroll_bar_default_height)
(w32_createhscrollbar): New functions.
(w32_createscrollbar): Rename to w32_createvscrollbar.
(w32_createwindow): Init WND_HSCROLLBAR_INDEX.
(w32_name_of_message): Replace WM_EMACS_CREATESCROLLBAR by
WM_EMACS_CREATEVSCROLLBAR and WM_EMACS_CREATEHSCROLLBAR.  Add
WM_EMACS_SHOWCURSOR.
(w32_wnd_proc): Handle WM_HSCROLL case.  In WM_WINDOWPOSCHANGING
case do not artificially impose WM size hints.  Handle
WM_EMACS_SHOWCURSOR case.  Replace WM_EMACS_CREATESCROLLBAR case
by WM_EMACS_CREATEVSCROLLBAR and WM_EMACS_CREATEHSCROLLBAR
cases.
(my_create_tip_window): Replace WND_SCROLLBAR_INDEX by
WND_VSCROLLBAR_INDEX and WND_HSCROLLBAR_INDEX.
(unwind_create_frame_1): Remove.
(Fx_create_frame): Make both scrollbars the system standard
width and height.  Use official field of frame structure to
inhibit running window-configuration-change-hook.
(x_create_tip_frame): Call SET_FRAME_LINES and change_frame_size
pixelwise.  Handle frame's official field.
(w32_frame_parm_handlers): Remove x_set_fringe_width
entries. Add x_set_scroll_bar_height,
x_set_horizontal_scroll_bars, x_set_left_fringe and
x_set_right_fringe.
* w32inevt.c (resize_event, maybe_generate_resize_event): Do not
pass height of menu bar to change_frame_size.
* w32menu.c (set_frame_menubar): Rewrite using
frame_inhibit_resize.
* w32term.h (struct w32_display_info): Add
horizontal_scroll_bar_cursor and cursor_display_counter.
(struct scroll_bar): Add horizontal.
(HORIZONTAL_SCROLL_BAR_INSIDE_HEIGHT)
(HORIZONTAL_SCROLL_BAR_LEFT_RANGE)
(HORIZONTAL_SCROLL_BAR_INSIDE_WIDTH)
(HORIZONTAL_SCROLL_BAR_LEFT_BORDER)
(HORIZONTAL_SCROLL_BAR_RIGHT_BORDER)
(HORIZONTAL_SCROLL_BAR_TOP_BORDER)
(HORIZONTAL_SCROLL_BAR_BOTTOM_BORDER)
(HORIZONTAL_SCROLL_BAR_MIN_HANDLE): New macros.
(WM_EMACS_CREATEVSCROLLBAR, WM_EMACS_CREATEHSCROLLBAR): Define
instead of WM_EMACS_CREATESCROLLBAR.
(WND_VSCROLLBAR_INDEX, WND_HSCROLLBAR_INDEX): Define instead of
WND_SCROLLBAR_INDEX.
* w32term.c (horizontal_scroll_bar_min_handle)
(horizontal_scroll_bar_left_border)
(horizontal_scroll_bar_right_border): New integers.
(x_set_frame_alpha): Replace x_highlight_frame by
w32_focus_frame.
(x_window_to_scroll_bar): New argument "type".  Update callers
accordingly.
(w32_set_horizontal_scroll_bar_thumb)
(x_horizontal_scroll_bar_report_motion)
(w32_set_horizontal_scroll_bar)
(w32_horizontal_scroll_bar_handle_click)
(x_horizontal_scroll_bar_report_motion): New functions.
(w32_mouse_position): Discriminate horizontal and vertical
scrollbar cases.
(my_create_scrollbar): Replace with two new functions
my_create_vscrollbar and my_create_hscrollbar.
(x_scroll_bar_create): New argument "horizontal".  Update
callers accordingly.
(x_scroll_bar_remove, w32_condemn_scroll_bars)
(w32_redeem_scroll_bar, x_scroll_bar_clear): Handle horizontal
scroll bar case.
(w32_read_socket): Handle WM_HSCROLL cae.
(x_new_font): Don't recompute fringe widths.  Use
frame_inhibit_resize.  Calculate new menu bar height iff we
build without toolkit.  Always clear under internal border.
(x_set_window_size): Don't check frame size or recompute
fringes.  Reset fullscreen status before applying sizes.  Always
resize as requested by pixelwise argument.  Don't call
do_pending_window_change.
(x_wm_set_size_hint): Add call for FRAME_SCROLL_BAR_AREA_HEIGHT.
(w32_initialize_display_info): Initialize dpyinfo's
horizontal_scroll_bar_cursor entry.
(w32_create_terminal): Add set_horizontal_scroll_bar_hook.
(w32_initialize): Init horizontal_scroll_bar_min_handle and
horizontal_scroll_bar_left_border.
(w32fullscreen_hook): Intermittently resize window to normal
when switching from fullscreen to maximized state.
(run_window_configuration_change_hook): Don't run it if frame is
not official yet.
(unwind_change_frame): Remove.
(Fset_window_configuration): Rewrite using frame's official field.
* widget.c (set_frame_size): Don't call compute_fringe_widths.
(EmacsFrameSetCharSize): Obey frame_inhibit_resize.
* window.h (struct window): New fields old_pointm,
horizontal_scroll_bar, horizontal_scroll_bar_type, hscroll_whole,
scroll_bar_height and suspend_auto_hscroll.
(wset_horizontal_scroll_bar, wset_horizontal_scroll_bar_type):
New functions.
(sanitize_window_sizes): Extern.
(MINI_NON_ONLY_WINDOW_P, MINI_ONLY_WINDOW_P, WINDOW_PSEUDO_P)
(WINDOW_TOPMOST_P, WINDOW_HAS_HORIZONTAL_SCROLL_BAR)
(WINDOW_CONFIG_SCROLL_BAR_HEIGHT)
(WINDOW_CONFIG_SCROLL_BAR_LINES)
(WINDOW_SCROLL_BAR_LINES, WINDOW_SCROLL_BAR_AREA_HEIGHT): New
macros.
(WINDOW_LEFT_FRINGE_COLS, WINDOW_RIGHT_FRINGE_COLS)
(WINDOW_FRINGE_COLS, WINDOW_FRINGE_EXTENDED_P): Remove macros.
(WINDOW_VERTICAL_SCROLL_BAR_TYPE)
(WINDOW_HAS_VERTICAL_SCROLL_BAR_ON_LEFT)
(WINDOW_HAS_VERTICAL_SCROLL_BAR_ON_RIGHT)
(WINDOW_HAS_VERTICAL_SCROLL_BAR): Minor rewrite.
(WINDOW_BOX_HEIGHT_NO_MODE_LINE, WINDOW_BOX_TEXT_HEIGHT)
(WINDOW_SCROLL_BAR_AREA_Y): Count in scroll bar height.
* window.c (wset_old_pointm, Fwindow_scroll_bar_height)
(Fwindow_old_point, sanitize_window_sizes): New functions.
(Qwindow_sanitize_window_sizes): New symbol.
(window_body_height): Count in horizontal scroll bar.
(set_window_hscroll, Fscroll_left, Fscroll_right): Set
suspend_auto_hscroll slot.
(Fwindow_inside_edges): Count fringes pixelwise.
(coordinates_in_window, Fcoordinates_in_window_p): Consider
horizontal scroll bar.
(check_frame_size, adjust_window_margins): Remove functions and
corresponding calls.
(set_window_buffer): Initialize old_pointm and horizontal scroll
bars.
(temp_output_buffer_show): Reset hscroll related fields.
Initialize old_pointm.
(make_parent_window): Initialize old_pointm.
(make_window): Initialize old_pointm, horizontal scroll bar type,
and scroll bar height.
(resize_frame_windows): Don't count top margin in new sizes.
Don't use safe sizes when shrinking a frame; let the window
manager do the clipping.
(Fsplit_window_internal): Inherit horizontal scroll bar type and
height.
(Fdelete_window_internal): Unchain old_pointm marker.
(window_scroll_pixel_based, Fscroll_other_window): Adjust
old_pointm.
(Fwindow_text_width, Fwindow_text_height): New argument
"pixelwise".
(struct saved_window): New fields, old_pointm, hscroll_whole,
suspend_auto_hscroll, scroll_bar_height and
horizontal_scroll_bar_type.
(Fset_window_configuration, save_window_save): Set new fields of
saved_window.
(apply_window_adjustment): Don't call adjust_window_margins.
(set_window_margins): Don't change margins if new sizes don't
fit into window.
(set_window_scroll_bars): New argument "horizontal_type".
Handle horizontal scroll bars.  Don't change scroll bars if they
don't fit into window.
(Fset_window_scroll_bars): New argument "horizontal_type".
(Fwindow_scroll_bars): Return values for horizontal scroll bars.
(compare_window_configurations): Compare horizontal scroll bar
settings.
* xdisp.c (window_text_bottom_y, window_box_height): Count in
horizontal scroll bar height.
(pixel_to_glyph_coords, init_xdisp): Use FRAME_TOTAL_LINES
instead of FRAME_LINES.
(remember_mouse_glyph): Case ON_SCROLL_BAR changed to
ON_VERTICAL_SCROLL_BAR.
(with_echo_area_buffer): Initialize old_pointm.
(with_echo_area_buffer_unwind_data): Store old_pointm values in
vector.
(unwind_with_echo_area_buffer): Handle old_pointm.
(update_tool_bar): Set do_update when the tool bar window has at
least one line (since this is what the user sets).
(MAX_FRAME_TOOL_BAR_HEIGHT): Remove macro.
(redisplay_tool_bar): Return early when toolbar has zero lines.
Call x_change_tool_bar_height.  Don't use max_tool_bar_height.
(hscroll_window_tree): Handle suspension of auto_hscroll and
old_pointm.
(set_horizontal_scroll_bar): New function.
(redisplay_window): Set ignore_mouse_drag_p when tool bar has
more than one line.  Handle horizontal scroll bars.
(note_mouse_highlight): Handle horizontal scrol bars.
(expose_frame): Set dimensions of XRectangle from frame's text
sizes.
(Vvoid_text_area_pointer): Update doc-string.
* xfns.c (x_set_menu_bar_lines): Use adjust_frame_size.
(x_change_tool_bar_height, x_set_scroll_bar_default_height)
(x_set_internal_border_width): New functions.
(x_set_tool_bar_lines): Call x_change_tool_bar_height.
(unwind_create_frame_1): Remove.
(Fx_create_frame): Handle horizontal scroll bars.  Use official
field of frame structure to inhibit running
window-configuration-change-hook.
(x_create_tip_frame): Call SET_FRAME_LINES and change_frame_size
pixelwise.  Handle frame's official field.
(x_frame_parm_handlers): Add x_set_scroll_bar_height,
x_set_horizontal_scroll_bars, x_set_left_fringe,
x_set_right_fringe.
* xmenu.c (update_frame_menubar, free_frame_menubar): Use
adjust_frame_size.
* xterm.h (struct x_display_info): Add
horizontal_scroll_bar_cursor and Xatom_Horizontal_Scrollbar
slots.
(struct scroll_bar): Add horizontal slot.
(HORIZONTAL_SCROLL_BAR_INSIDE_HEIGHT)
(HORIZONTAL_SCROLL_BAR_LEFT_RANGE)
(HORIZONTAL_SCROLL_BAR_INSIDE_WIDTH): New macros.
(HORIZONTAL_SCROLL_BAR_LEFT_BORDER)
(HORIZONTAL_SCROLL_BAR_RIGHT_BORDER)
(HORIZONTAL_SCROLL_BAR_TOP_BORDER)
(HORIZONTAL_SCROLL_BAR_BOTTOM_BORDER)
(HORIZONTAL_SCROLL_BAR_MIN_HANDLE): Define.
(x_clear_under_internal_border): Remove.
* xterm.c (XTmouse_position): Handle horizontal scroll bars.
(x_window_to_scroll_bar): New argument TYPE.  Update callers.
(x_send_scroll_bar_event, x_scroll_bar_create): New arguments
HORIZONTAL.  Update callers.
(horizontal_action_hook_id): New action hook id.
(x_horizontal_scroll_bar_to_input_event)
(x_create_horizontal_toolkit_scroll_bar)
(xt_horizontal_action_hook)
(x_set_toolkit_horizontal_scroll_bar_thumb)
(XTset_horizontal_scroll_bar, x_net_wm_state)
(x_horizontal_scroll_bar_report_motion): New functions.
(xg_scroll_callback, x_scroll_bar_handle_click): Handle
horizontal scroll bars.
(SCROLL_BAR_HORIZONTAL_NAME): Define.
(XTset_vertical_scroll_bar): Attempt to clear areas not covered
by scroll bar.
(XTcondemn_scroll_bars, XTredeem_scroll_bar): Rewrite.  Handle
horizontal scroll bars.
(handle_one_xevent): Handle horizontal scroll bar events.  Call
x_net_wm_state.
(x_set_window_size_1, x_wm_set_size_hint): Don't call
check_frame_size.
(x_set_window_size): Don't call check_frame_size and
do_pending_window_change.
(x_term_init): Init horizontal_scroll_bar_cursor display info.
(x_create_terminal): Add set_horizontal_scroll_bar_hook.
(x_scroll_bar_set_handle): Add some checks when calling
x_clear_area.

6 files changed, 363 insertions, 141 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 454dc823ef7..3f97396ca02 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,39 @@
+2014-07-27  Martin Rudalics  <rudalics@gmx.at>
+
+        * frame.el (frame-notice-user-settings): Rewrite using
+        frame-initial-frame-tool-bar-height.
+        * menu-bar.el (menu-bar-horizontal-scroll-bar)
+        (menu-bar-no-horizontal-scroll-bar): New functions.
+        (menu-bar-showhide-scroll-bar-menu): Add bindings for horizontal
+        scroll bars.
+        * scroll-bar.el (scroll-bar-lines)
+        (set-horizontal-scroll-bar-mode)
+        (get-horizontal-scroll-bar-mode, horizontal-scroll-bar-mode)
+        (scroll-bar-horizontal-drag-1, scroll-bar-horizontal-drag)
+        (scroll-bar-toolkit-horizontal-scroll): New functions.
+        (horizontal-scroll-bar-mode)
+        (previous-horizontal-scroll-bar-mode)
+        (horizontal-scroll-bar-mode-explicit): New variables.
+        (horizontal-scroll-bar-mode): New option.
+        (toggle-horizontal-scroll-bar): Do something.
+        (top-level): Bind horizontal-scroll-bar mouse-1.
+        * startup.el (tool-bar-originally-present): Remove variable.
+        (command-line): Don't set tool-bar-originally-present.
+        * window.el (window-min-height): Update doc-string.
+        (window--dump-frame): Dump horizontal scroll bar values.
+        (window--min-size-1): Handle minibuffer window separately.
+        Count in margins and horizontal scroll bar.  Return safe value
+        iff IGNORE equals 'safe.
+        (frame-windows-min-size): New function (used by frame resizing
+        routines).
+        (fit-frame-to-buffer, fit-window-to-buffer): Count in horizontal
+        scroll bars.
+        (window--sanitize-window-sizes): New function.
+        (window-split-min-size): Remove.
+        (split-window): Count divider-width.  Don't use
+        `window-split-min-size' any more.  Reword error messages.
+        Sanitize windows sizes after splitting.
+
 2014-07-27  Thien-Thi Nguyen  <ttn@gnu.org>
 
         Use `defvar-local' more.
diff --git a/lisp/frame.el b/lisp/frame.el
index 9a170134e3d..d3e84d21024 100644
--- a/lisp/frame.el
+++ b/lisp/frame.el
@@ -256,60 +256,43 @@ there (in decreasing order of priority)."
     ;; If the initial frame is still around, apply initial-frame-alist
     ;; and default-frame-alist to it.
     (when (frame-live-p frame-initial-frame)
-
       ;; When tool-bar has been switched off, correct the frame size
       ;; by the lines added in x-create-frame for the tool-bar and
       ;; switch `tool-bar-mode' off.
       (when (display-graphic-p)
-        (let ((tool-bar-lines (or (assq 'tool-bar-lines initial-frame-alist)
-                                  (assq 'tool-bar-lines window-system-frame-alist)
-                                  (assq 'tool-bar-lines default-frame-alist))))
-          (when (and tool-bar-originally-present
-                     (or (null tool-bar-lines)
-                         (null (cdr tool-bar-lines))
-                         (eq 0 (cdr tool-bar-lines))))
-            (let* ((char-height (frame-char-height frame-initial-frame))
-                   (image-height tool-bar-images-pixel-height)
-                   (margin (cond ((and (consp tool-bar-button-margin)
-                                       (integerp (cdr tool-bar-button-margin))
-                                       (> tool-bar-button-margin 0))
-                                  (cdr tool-bar-button-margin))
-                                 ((and (integerp tool-bar-button-margin)
-                                       (> tool-bar-button-margin 0))
-                                  tool-bar-button-margin)
-                                 (t 0)))
-                   (relief (if (and (integerp tool-bar-button-relief)
-                                    (> tool-bar-button-relief 0))
-                               tool-bar-button-relief 3))
-                   (lines (/ (+ image-height
-                                (* 2 margin)
-                                (* 2 relief)
-                                (1- char-height))
-                             char-height))
-                   (height (frame-parameter frame-initial-frame 'height))
-                   (newparms (list (cons 'height (- height lines))))
-                   (initial-top (cdr (assq 'top
-                                           frame-initial-geometry-arguments)))
+        (let ((tool-bar-lines
+               (or (assq 'tool-bar-lines initial-frame-alist)
+                   (assq 'tool-bar-lines window-system-frame-alist)
+                   (assq 'tool-bar-lines default-frame-alist))))
+          ;; Shrink frame by its initial tool bar height iff either zero
+          ;; tool bar lines have been requested in one of the frame's
+          ;; alists or tool bar mode has been turned off explicitly in
+          ;; the user's init file.
+          (when (and tool-bar-lines
+                     (> frame-initial-frame-tool-bar-height 0)
+                     (or (not tool-bar-mode)
+                         (null (cdr tool-bar-lines))
+                         (eq 0 (cdr tool-bar-lines))))
+            (set-frame-height
+             frame-initial-frame (- (frame-text-height frame-initial-frame)
+                                    frame-initial-frame-tool-bar-height)
+             nil t)
+            (let* ((initial-top
+                    (cdr (assq 'top frame-initial-geometry-arguments)))
                    (top (frame-parameter frame-initial-frame 'top)))
               (when (and (consp initial-top) (eq '- (car initial-top)))
                 (let ((adjusted-top
-                       (cond ((and (consp top)
-                                   (eq '+ (car top)))
-                              (list '+
-                                    (+ (cadr top)
-                                       (* lines char-height))))
-                             ((and (consp top)
-                                   (eq '- (car top)))
-                              (list '-
-                                    (- (cadr top)
-                                       (* lines char-height))))
-                             (t (+ top (* lines char-height))))))
-                  (setq newparms
-                        (append newparms
-                                `((top . ,adjusted-top))
-                                nil))))
-              (modify-frame-parameters frame-initial-frame newparms)
-              (tool-bar-mode -1)))))
+                       (cond
+                        ((and (consp top) (eq '+ (car top)))
+                         (list '+ (+ (cadr top)
+                                     frame-initial-frame-tool-bar-height)))
+                        ((and (consp top) (eq '- (car top)))
+                         (list '- (- (cadr top)
+                                     frame-initial-frame-tool-bar-height)))
+                        (t (+ top frame-initial-frame-tool-bar-height)))))
+                  (modify-frame-parameters
+                   frame-initial-frame '((top . adjusted-top))))))
+            (tool-bar-mode -1))))
 
       ;; The initial frame we create above always has a minibuffer.
       ;; If the user wants to remove it, or make it a minibuffer-only
diff --git a/lisp/menu-bar.el b/lisp/menu-bar.el
index c816488c6d1..5ad4bed49b8 100644
--- a/lisp/menu-bar.el
+++ b/lisp/menu-bar.el
@@ -887,8 +887,35 @@ by \"Save Options\" in Custom buffers.")
   (interactive)
   (customize-set-variable 'scroll-bar-mode nil))
 
+(defun menu-bar-horizontal-scroll-bar ()
+  "Display horizontal scroll bars on each window."
+  (interactive)
+  (customize-set-variable 'horizontal-scroll-bar-mode t))
+
+(defun menu-bar-no-horizontal-scroll-bar ()
+  "Turn off horizontal scroll bars."
+  (interactive)
+  (customize-set-variable 'horizontal-scroll-bar-mode nil))
+
 (defvar menu-bar-showhide-scroll-bar-menu
   (let ((menu (make-sparse-keymap "Scroll-bar")))
+    (bindings--define-key menu [horizontal]
+      '(menu-item "Horizontal"
+                  menu-bar-horizontal-scroll-bar
+                  :help "Horizontal scroll bar"
+                  :visible (display-graphic-p)
+                  :button (:radio . (eq (cdr (assq 'horizontal-scroll-bars
+                                                   (frame-parameters)))
+                                        t))))
+
+    (bindings--define-key menu [none-horizontal]
+      '(menu-item "None-horizontal"
+                  menu-bar-no-horizontal-scroll-bar
+                  :help "Turn off horizontal scroll bars"
+                  :visible (display-graphic-p)
+                  :button (:radio . (eq (cdr (assq 'horizontal-scroll-bars
+                                                   (frame-parameters)))
+                                        nil))))
 
     (bindings--define-key menu [right]
       '(menu-item "On the Right"
@@ -896,7 +923,8 @@ by \"Save Options\" in Custom buffers.")
                   :help "Scroll-bar on the right side"
                   :visible (display-graphic-p)
                   :button (:radio . (eq (cdr (assq 'vertical-scroll-bars
-                                                   (frame-parameters))) 'right))))
+                                                   (frame-parameters)))
+                                        'right))))
 
     (bindings--define-key menu [left]
       '(menu-item "On the Left"
@@ -904,7 +932,8 @@ by \"Save Options\" in Custom buffers.")
                   :help "Scroll-bar on the left side"
                   :visible (display-graphic-p)
                   :button (:radio . (eq (cdr (assq 'vertical-scroll-bars
-                                                   (frame-parameters))) 'left))))
+                                                   (frame-parameters)))
+                                        'left))))
 
     (bindings--define-key menu [none]
       '(menu-item "None"
@@ -912,7 +941,8 @@ by \"Save Options\" in Custom buffers.")
                   :help "Turn off scroll-bar"
                   :visible (display-graphic-p)
                   :button (:radio . (eq (cdr (assq 'vertical-scroll-bars
-                                                   (frame-parameters))) nil))))
+                                                   (frame-parameters)))
+                                        nil))))
     menu))
 
 (defun menu-bar-frame-for-menubar ()
diff --git a/lisp/scroll-bar.el b/lisp/scroll-bar.el
index 2990e8e5ffa..09f30d5d3f0 100644
--- a/lisp/scroll-bar.el
+++ b/lisp/scroll-bar.el
@@ -70,16 +70,36 @@ SIDE must be the symbol `left' or `right'."
                (frame-char-width)))
      (0))))
 
+(defun scroll-bar-lines ()
+  "Return the height, measured in lines, of the horizontal scrollbar."
+  (let* ((wsb   (window-scroll-bars))
+         (htype (nth 5 wsb))
+         (lines  (nth 4 wsb)))
+    (cond
+     (htype lines)
+     ((frame-parameter nil 'horizontal-scroll-bars)
+      ;; nil means it's a non-toolkit scroll bar (which is currently
+      ;; impossible), and its width in columns is 14 pixels rounded up.
+      (ceiling (or (frame-parameter nil 'scroll-bar-height) 14)
+               (frame-char-width)))
+     (0))))
+
 
 ;;;; Helpful functions for enabling and disabling scroll bars.
 
 (defvar scroll-bar-mode)
+(defvar horizontal-scroll-bar-mode)
 (defvar previous-scroll-bar-mode nil)
+(defvar previous-horizontal-scroll-bar-mode nil)
 
 (defvar scroll-bar-mode-explicit nil
   "Non-nil means `set-scroll-bar-mode' should really do something.
 This is nil while loading `scroll-bar.el', and t afterward.")
 
+(defvar horizontal-scroll-bar-mode-explicit nil
+  "Non-nil means `set-horizontal-scroll-bar-mode' should really do something.
+This is nil while loading `scroll-bar.el', and t afterward.")
+
 (defun set-scroll-bar-mode (value)
   "Set the scroll bar mode to VALUE and put the new value into effect.
 See the `scroll-bar-mode' variable for possible values to use."
@@ -92,6 +112,18 @@ See the `scroll-bar-mode' variable for possible values to use."
     (modify-all-frames-parameters (list (cons 'vertical-scroll-bars
                                               scroll-bar-mode)))))
 
+(defun set-horizontal-scroll-bar-mode (value)
+  "Set the horizontal scroll bar mode to VALUE and put the new value into effect.
+See the `horizontal-scroll-bar-mode' variable for possible values to use."
+  (if horizontal-scroll-bar-mode
+      (setq previous-horizontal-scroll-bar-mode horizontal-scroll-bar-mode))
+
+  (setq horizontal-scroll-bar-mode value)
+
+  (when horizontal-scroll-bar-mode-explicit
+    (modify-all-frames-parameters (list (cons 'horizontal-scroll-bars
+                                              horizontal-scroll-bar-mode)))))
+
 (defcustom scroll-bar-mode default-frame-scroll-bars
   "Specify whether to have vertical scroll bars, and on which side.
 Possible values are nil (no scroll bars), `left' (scroll bars on left)
@@ -108,14 +140,32 @@ Setting the variable with a customization buffer also takes effect."
   :initialize 'custom-initialize-default
   :set (lambda (_sym val) (set-scroll-bar-mode val)))
 
+(defcustom horizontal-scroll-bar-mode default-frame-horizontal-scroll-bars
+  "Specify whether to have horizontal scroll bars, and on which side.
+To set this variable in a Lisp program, use `set-horizontal-scroll-bar-mode'
+to make it take real effect.
+Setting the variable with a customization buffer also takes effect."
+  :type '(choice (const :tag "none (nil)" nil)
+                 (const t))
+  :group 'frames
+  ;; The default value for :initialize would try to use :set
+  ;; when processing the file in cus-dep.el.
+  :initialize 'custom-initialize-default
+  :set (lambda (_sym val) (set-horizontal-scroll-bar-mode val)))
+
 ;; We just set scroll-bar-mode, but that was the default.
 ;; If it is set again, that is for real.
 (setq scroll-bar-mode-explicit t)
+(setq horizontal-scroll-bar-mode-explicit t)
 
 (defun get-scroll-bar-mode ()
   (declare (gv-setter set-scroll-bar-mode))
   scroll-bar-mode)
 
+(defun get-horizontal-scroll-bar-mode ()
+  (declare (gv-setter set-horizontal-scroll-bar-mode))
+  horizontal-scroll-bar-mode)
+
 (define-minor-mode scroll-bar-mode
   "Toggle vertical scroll bars on all frames (Scroll Bar mode).
 With a prefix argument ARG, enable Scroll Bar mode if ARG is
@@ -126,8 +176,21 @@ This command applies to all frames that exist and frames to be
 created in the future."
   :variable ((get-scroll-bar-mode)
              . (lambda (v) (set-scroll-bar-mode
-                       (if v (or previous-scroll-bar-mode
-                                 default-frame-scroll-bars))))))
+                            (if v (or previous-scroll-bar-mode
+                                      default-frame-scroll-bars))))))
+
+(define-minor-mode horizontal-scroll-bar-mode
+  "Toggle horizontal scroll bars on all frames (Horizontal Scroll Bar mode).
+With a prefix argument ARG, enable Horizontal Scroll Bar mode if
+ARG is positive, and disable it otherwise.  If called from Lisp,
+enable the mode if ARG is omitted or nil.
+
+This command applies to all frames that exist and frames to be
+created in the future."
+  :variable ((get-horizontal-scroll-bar-mode)
+             . (lambda (v) (set-horizontal-scroll-bar-mode
+                            (if v (or previous-scroll-bar-mode
+                                      default-frame-horizontal-scroll-bars))))))
 
 (defun toggle-scroll-bar (arg)
   "Toggle whether or not the selected frame has vertical scroll bars.
@@ -147,12 +210,21 @@ when they are turned on; if it is nil, they go on the left."
                (if (> arg 0)
                    (or scroll-bar-mode default-frame-scroll-bars))))))
 
-(defun toggle-horizontal-scroll-bar (_arg)
+(defun toggle-horizontal-scroll-bar (arg)
   "Toggle whether or not the selected frame has horizontal scroll bars.
-With arg, turn horizontal scroll bars on if and only if arg is positive.
-Horizontal scroll bars aren't implemented yet."
+With arg, turn horizontal scroll bars on if and only if arg is positive."
   (interactive "P")
-  (error "Horizontal scroll bars aren't implemented yet"))
+  (if (null arg)
+      (setq arg
+            (if (cdr (assq 'horizontal-scroll-bars
+                           (frame-parameters (selected-frame))))
+                -1 1))
+    (setq arg (prefix-numeric-value arg)))
+  (modify-frame-parameters
+   (selected-frame)
+   (list (cons 'horizontal-scroll-bars
+               (if (> arg 0)
+                   (or horizontal-scroll-bar-mode default-frame-horizontal-scroll-bars))))))
 
 ;;;; Buffer navigation using the scroll bar.
 
@@ -249,6 +321,45 @@ If you click outside the slider, the window scrolls to bring the slider there."
     (with-current-buffer (window-buffer window)
       (setq point-before-scroll before-scroll))))
 
+;; Scroll the window to the proper position for EVENT.
+(defun scroll-bar-horizontal-drag-1 (event)
+  (let* ((start-position (event-start event))
+         (window (nth 0 start-position))
+         (portion-whole (nth 2 start-position))
+         (unit (frame-char-width (window-frame window))))
+    (set-window-hscroll
+     window (/ (1- (+ (car portion-whole) unit)) unit))))
+
+(defun scroll-bar-horizontal-drag (event)
+  "Scroll the window horizontally by dragging the scroll bar slider.
+If you click outside the slider, the window scrolls to bring the slider there."
+  (interactive "e")
+  (let* (done
+         (echo-keystrokes 0)
+         (end-position (event-end event))
+         (window (nth 0 end-position))
+         (before-scroll))
+    (with-current-buffer (window-buffer window)
+      (setq before-scroll point-before-scroll))
+    (save-selected-window
+      (select-window window)
+      (setq before-scroll
+            (or before-scroll (point))))
+    (scroll-bar-horizontal-drag-1 event)
+    (track-mouse
+      (while (not done)
+        (setq event (read-event))
+        (if (eq (car-safe event) 'mouse-movement)
+            (setq event (read-event)))
+        (cond ((eq (car-safe event) 'scroll-bar-movement)
+               (scroll-bar-horizontal-drag-1 event))
+              (t
+               ;; Exit when we get the drag event; ignore that event.
+               (setq done t)))))
+    (sit-for 0)
+    (with-current-buffer (window-buffer window)
+      (setq point-before-scroll before-scroll))))
+
 (defun scroll-bar-scroll-down (event)
   "Scroll the window's top line down to the location of the scroll bar click.
 EVENT should be a scroll bar click."
@@ -300,47 +411,92 @@ EVENT should be a scroll bar click."
          (window (nth 0 end-position))
          (part (nth 4 end-position))
          before-scroll)
-    (cond ((eq part 'end-scroll))
-          (t
-           (with-current-buffer (window-buffer window)
-             (setq before-scroll point-before-scroll))
-           (save-selected-window
-             (select-window window)
-             (setq before-scroll (or before-scroll (point)))
-             (cond ((eq part 'above-handle)
-                    (scroll-up '-))
-                   ((eq part 'below-handle)
-                    (scroll-up nil))
-                   ((eq part 'ratio)
-                    (let* ((portion-whole (nth 2 end-position))
-                           (lines (scroll-bar-scale portion-whole
-                                                    (1- (window-height)))))
-                      (scroll-up (cond ((not (zerop lines)) lines)
-                                       ((< (car portion-whole) 0) -1)
-                                       (t 1)))))
-                   ((eq part 'up)
-                    (scroll-up -1))
-                   ((eq part 'down)
-                    (scroll-up 1))
-                   ((eq part 'top)
-                    (set-window-start window (point-min)))
-                   ((eq part 'bottom)
-                    (goto-char (point-max))
-                    (recenter))
-                   ((eq part 'handle)
-                    (scroll-bar-drag-1 event))))
-           (sit-for 0)
-           (with-current-buffer (window-buffer window)
-             (setq point-before-scroll before-scroll))))))
-
+    (cond
+     ((eq part 'end-scroll))
+     (t
+      (with-current-buffer (window-buffer window)
+        (setq before-scroll point-before-scroll))
+      (save-selected-window
+        (select-window window)
+        (setq before-scroll (or before-scroll (point)))
+        (cond
+         ((eq part 'above-handle)
+          (scroll-up '-))
+         ((eq part 'below-handle)
+          (scroll-up nil))
+         ((eq part 'ratio)
+          (let* ((portion-whole (nth 2 end-position))
+                 (lines (scroll-bar-scale portion-whole
+                                          (1- (window-height)))))
+            (scroll-up (cond ((not (zerop lines)) lines)
+                             ((< (car portion-whole) 0) -1)
+                             (t 1)))))
+         ((eq part 'up)
+          (scroll-up -1))
+         ((eq part 'down)
+          (scroll-up 1))
+         ((eq part 'top)
+          (set-window-start window (point-min)))
+         ((eq part 'bottom)
+          (goto-char (point-max))
+          (recenter))
+         ((eq part 'handle)
+          (scroll-bar-drag-1 event))))
+      (sit-for 0)
+      (with-current-buffer (window-buffer window)
+        (setq point-before-scroll before-scroll))))))
 
+(defun scroll-bar-toolkit-horizontal-scroll (event)
+  (interactive "e")
+  (let* ((end-position (event-end event))
+         (window (nth 0 end-position))
+         (part (nth 4 end-position))
+         before-scroll)
+    (cond
+     ((eq part 'end-scroll))
+     (t
+      (with-current-buffer (window-buffer window)
+        (setq before-scroll point-before-scroll))
+      (save-selected-window
+        (select-window window)
+        (setq before-scroll (or before-scroll (point)))
+        (cond
+         ((eq part 'before-handle)
+          (scroll-right 4))
+         ((eq part 'after-handle)
+          (scroll-left 4))
+         ((eq part 'ratio)
+          (let* ((portion-whole (nth 2 end-position))
+                 (columns (scroll-bar-scale portion-whole
+                                            (1- (window-width)))))
+            (scroll-right
+             (cond
+              ((not (zerop columns))
+               columns)
+              ((< (car portion-whole) 0) -1)
+              (t 1)))))
+         ((eq part 'left)
+          (scroll-right 1))
+         ((eq part 'right)
+          (scroll-left 1))
+         ((eq part 'leftmost)
+          (goto-char (line-beginning-position)))
+         ((eq part 'rightmost)
+          (goto-char (line-end-position)))
+         ((eq part 'horizontal-handle)
+          (scroll-bar-horizontal-drag-1 event))))
+      (sit-for 0)
+      (with-current-buffer (window-buffer window)
+        (setq point-before-scroll before-scroll))))))
 
 ;;;; Bindings.
 
 ;; For now, we'll set things up to work like xterm.
 (cond ((and (boundp 'x-toolkit-scroll-bars) x-toolkit-scroll-bars)
        (global-set-key [vertical-scroll-bar mouse-1]
-                       'scroll-bar-toolkit-scroll))
+                       'scroll-bar-toolkit-scroll)
+       (global-set-key [horizontal-scroll-bar mouse-1]
+                       'scroll-bar-toolkit-horizontal-scroll))
       (t
        (global-set-key [vertical-scroll-bar mouse-1]
                        'scroll-bar-scroll-up)
diff --git a/lisp/startup.el b/lisp/startup.el
index d984e6269ae..144d732272f 100644
--- a/lisp/startup.el
+++ b/lisp/startup.el
@@ -719,9 +719,6 @@ It is the default value of the variable `top-level'."
 (defconst tool-bar-images-pixel-height 24
   "Height in pixels of images in the tool-bar.")
 
-(defvar tool-bar-originally-present nil
-  "Non-nil if tool-bars are present before user and site init files are read.")
-
 (defvar handle-args-function-alist '((nil . tty-handle-args))
   "Functions for processing window-system dependent command-line arguments.
 Window system startup files should add their own function to this
@@ -1042,18 +1039,6 @@ please check its value")
   (or (eq initial-window-system 'pc)
       (tty-register-default-colors))
 
-  ;; Record whether the tool-bar is present before the user and site
-  ;; init files are processed.  frame-notice-user-settings uses this
-  ;; to determine if the tool-bar has been disabled by the init files,
-  ;; and the frame needs to be resized.
-  (when (fboundp 'frame-notice-user-settings)
-    (let ((tool-bar-lines (or (assq 'tool-bar-lines initial-frame-alist)
-                              (assq 'tool-bar-lines default-frame-alist))))
-      (setq tool-bar-originally-present
-            (and tool-bar-lines
-                 (cdr tool-bar-lines)
-                 (not (eq 0 (cdr tool-bar-lines)))))))
-
   (let ((old-scalable-fonts-allowed scalable-fonts-allowed)
         (old-face-ignored-fonts face-ignored-fonts))
 
diff --git a/lisp/window.el b/lisp/window.el
index e1c79659773..a7dcd9a6612 100644
--- a/lisp/window.el
+++ b/lisp/window.el
@@ -378,9 +378,9 @@ Anything less might crash Emacs.")
 (defcustom window-min-height 4
   "The minimum total height, in lines, of any window.
 The value has to accommodate one text line, a mode and header
-line, and a bottom divider, if present.  A value less than
-`window-safe-min-height' is ignored.  The value of this variable
-is honored when windows are resized or split.
+line, a horizontal scroll bar and a bottom divider, if present.
+A value less than `window-safe-min-height' is ignored.  The value
+of this variable is honored when windows are resized or split.
 
 Applications should never rebind this variable.  To resize a
 window to a height less than the one specified here, an
@@ -1137,11 +1137,12 @@ dumping to it."
        (format "frame text pixel: %s x %s   cols/lines: %s x %s\n"
                (frame-text-width frame) (frame-text-height frame)
                (frame-text-cols frame) (frame-text-lines frame))
-       (format "tool: %s  scroll: %s  fringe: %s  border: %s  right: %s  bottom: %s\n\n"
+       (format "tool: %s  scroll: %s/%s  fringe: %s  border: %s  right: %s  bottom: %s\n\n"
                (if (fboundp 'tool-bar-height)
                    (tool-bar-height frame t)
                  "0")
                (frame-scroll-bar-width frame)
+               (frame-scroll-bar-height frame)
                (frame-fringe-width frame)
                (frame-border-width frame)
                (frame-right-divider-width frame)
@@ -1262,12 +1263,14 @@ of WINDOW."
           value)
       (with-current-buffer (window-buffer window)
         (cond
+         ((window-minibuffer-p window)
+          (if pixelwise (frame-char-height (window-frame window)) 1))
          ((and (not (window--size-ignore-p window ignore))
                (window-size-fixed-p window horizontal))
           ;; The minimum size of a fixed size window is its size.
           (window-size window horizontal pixelwise))
-         ((or (eq ignore 'safe) (eq ignore window))
-          ;; If IGNORE equals `safe' or WINDOW return the safe values.
+         ((eq ignore 'safe)
+          ;; If IGNORE equals `safe' return the safe value.
           (window-safe-min-size window horizontal pixelwise))
          (horizontal
           ;; For the minimum width of a window take fringes and
@@ -1278,8 +1281,11 @@ of WINDOW."
           ;; `window-min-width'.
           (let* ((char-size (frame-char-size window t))
                  (fringes (window-fringes window))
+                 (margins (window-margins window))
                  (pixel-width
                   (+ (window-safe-min-size window t t)
+                     (* (or (car margins) 0) char-size)
+                     (* (or (cdr margins) 0) char-size)
                      (car fringes) (cadr fringes)
                      (window-scroll-bar-width window)
                      (window-right-divider-width window))))
@@ -1301,6 +1307,7 @@ of WINDOW."
                 (pixel-height
                  (+ (window-safe-min-size window nil t)
                     (window-header-line-height window)
+                    (window-scroll-bar-height window)
                     (window-mode-line-height window)
                     (window-bottom-divider-width window))))
             (if pixelwise
@@ -1508,6 +1515,18 @@ by which WINDOW can be shrunk."
       (window--min-delta-1
        window (- size minimum) horizontal ignore trail noup pixelwise)))))
 
+(defun frame-windows-min-size (&optional frame horizontal pixelwise)
+  "Return minimum number of lines of FRAME's windows.
+HORIZONTAL non-nil means return number of columns of FRAME's
+windows.  PIXELWISE non-nil means return sizes in pixels."
+  (setq frame (window-normalize-frame frame))
+  (let* ((root (frame-root-window frame))
+         (mini (window-next-sibling root)))
+    (+ (window-min-size root horizontal nil pixelwise)
+       (if (and mini (not horizontal))
+           (window-min-size mini horizontal nil pixelwise)
+         0))))
+
 (defun window--max-delta-1 (window delta &optional horizontal ignore trail noup pixelwise)
   "Internal function of `window-max-delta'."
   (if (not (window-parent window))
@@ -2984,6 +3003,28 @@ routines."
          pixel-delta
        (/ pixel-delta (frame-char-height frame)))))
 
+(defun window--sanitize-window-sizes (frame horizontal)
+  "Assert that all windows on FRAME are large enough.
+If necessary and possible, make sure that every window on frame
+FRAME has its minimum height.  Optional argument HORIZONTAL
+non-nil means to make sure that every window on frame FRAME has
+its minimum width.  The minimumm height/width of a window is the
+respective value returned by `window-min-size' for that window.
+
+Return t if all windows were resized appropriately.  Return nil
+if at least one window could not be resized as requested, which
+may happen when the FRAME is not large enough to accomodate it."
+  (let ((value t))
+    (walk-window-tree
+     (lambda (window)
+       (let  ((delta (- (window-min-size window horizontal nil t)
+                        (window-size window horizontal t))))
+         (when (> delta 0)
+           (if (window-resizable-p window delta horizontal nil t)
+               (window-resize window delta horizontal nil t)
+             (setq value nil))))))
+    value))
+
 (defun adjust-window-trailing-edge (window delta &optional horizontal pixelwise)
   "Move WINDOW's bottom edge by DELTA lines.
 Optional argument HORIZONTAL non-nil means move WINDOW's right
@@ -4241,20 +4282,6 @@ showing BUFFER-OR-NAME."
         ;; If a window doesn't show BUFFER, unrecord BUFFER in it.
         (unrecord-window-buffer window buffer)))))
 
-;;; Splitting windows.
-(defun window-split-min-size (&optional horizontal pixelwise)
-  "Return minimum height of any window when splitting windows.
-Optional argument HORIZONTAL non-nil means return minimum width."
-  (cond
-   (pixelwise
-    (if horizontal
-        (window-min-pixel-width)
-      (window-min-pixel-height)))
-   (horizontal
-    (max window-min-width window-safe-min-width))
-   (t
-    (max window-min-height window-safe-min-height))))
-
 (defun split-window (&optional window size side pixelwise)
   "Make a new window adjacent to WINDOW.
 WINDOW must be a valid window and defaults to the selected one.
@@ -4318,6 +4345,9 @@ frame.  The selected window is not changed by this function."
          (pixel-size
           (when (numberp size)
             (window--size-to-pixel window size horizontal pixelwise t)))
+         (divider-width (if horizontal
+                            (frame-right-divider-width frame)
+                          (frame-bottom-divider-width frame)))
          atom-root)
     (window--check frame)
     (catch 'done
@@ -4419,19 +4449,14 @@ frame.  The selected window is not changed by this function."
           (cond
            (resize
             ;; SIZE unspecified, resizing.
-            (when (and (not (window-sizable-p
-                             parent (- new-pixel-size) horizontal nil t))
-                       ;; Try again with minimum split size.
-                       (setq new-pixel-size
-                             (max new-pixel-size
-                                  (window-split-min-size horizontal t)))
-                       (not (window-sizable-p
-                             parent (- new-pixel-size) horizontal nil t)))
-              (error "Window %s too small for splitting 1" parent)))
-           ((> (+ new-pixel-size (window-min-size window horizontal nil t))
+            (unless (window-sizable-p
+                     parent (- new-pixel-size divider-width) horizontal nil t)
+              (error "Window %s too small for splitting (1)" parent)))
+           ((> (+ new-pixel-size divider-width
+                  (window-min-size window horizontal nil t))
                old-pixel-size)
             ;; SIZE unspecified, no resizing.
-            (error "Window %s too small for splitting 2" window))))
+            (error "Window %s too small for splitting (2)" window))))
          ((and (>= pixel-size 0)
                (or (>= pixel-size old-pixel-size)
                    (< new-pixel-size
@@ -4439,19 +4464,19 @@ frame.  The selected window is not changed by this function."
           ;; SIZE specified as new size of old window.  If the new size
           ;; is larger than the old size or the size of the new window
           ;; would be less than the safe minimum, signal an error.
-          (error "Window %s too small for splitting 3" window))
+          (error "Window %s too small for splitting (3)" window))
          (resize
           ;; SIZE specified, resizing.
           (unless (window-sizable-p
-                   parent (- new-pixel-size) horizontal nil t)
+                   parent (- new-pixel-size divider-width) horizontal nil t)
             ;; If we cannot resize the parent give up.
-            (error "Window %s too small for splitting 4" parent)))
+            (error "Window %s too small for splitting (4)" parent)))
          ((or (< new-pixel-size
                  (window-safe-min-pixel-size window horizontal))
               (< (- old-pixel-size new-pixel-size)
                  (window-safe-min-pixel-size window horizontal)))
           ;; SIZE specification violates minimum size restrictions.
-          (error "Window %s too small for splitting 5" window)))
+          (error "Window %s too small for splitting (5)" window)))
 
         (window--resize-reset frame horizontal)
 
@@ -4522,6 +4547,9 @@ frame.  The selected window is not changed by this function."
               (set-window-parameter (window-parent new) 'window-atom t))
             (set-window-parameter new 'window-atom t)))
 
+          ;; Sanitize sizes.
+          (window--sanitize-window-sizes frame horizontal)
+
           (run-window-configuration-change-hook frame)
           (run-window-scroll-functions new)
           (window--check frame)
@@ -7116,7 +7144,10 @@ FRAME."
              (value (window-text-pixel-size
                      nil t t workarea-width workarea-height t))
              (width (+ (car value) (window-right-divider-width)))
-             (height (+ (cdr value) (window-bottom-divider-width))))
+             (height
+              (+ (cdr value)
+                 (window-bottom-divider-width)
+                 (nth 3 (window-scroll-bars)))))
         ;; Don't change height or width when the window's size is fixed
         ;; in either direction or ONLY forbids it.
         (cond
@@ -7275,6 +7306,7 @@ accessible position."
           ;; height.  Its width remains fixed.
           (setq height (+ (cdr (window-text-pixel-size
                                 nil nil t nil (frame-pixel-height) t))
+                          (nth 3 (window-scroll-bars window))
                           (window-bottom-divider-width)))
           ;; Round height.
           (unless pixelwise