Handle persistence of windows' scroll bar and fringes settings (Bug#36193)

* doc/lispref/display.texi (Fringe Size/Pos): Document new
argument PERSISTENT of 'set-window-fringes'.
(Scroll Bars): Document new argument PERSISTENT of
'set-window-scroll-bars'.  Mention that HORIZONTAL-TYPE must
be 'bottom' to show a horizontal scroll bar on mini windows.
* lisp/window.el (window-min-pixel-height): For mini windows the
minimum height is one line.
(window--min-size-1): Use value returned by
'window-min-pixel-height' when dealing with mini windows.
(window--resize-mini-window): Try to handle horizontal scroll
bars and size restrictions more accurately.
(window--state-put-2): Handle persistence of scroll bar
settings.
* src/frame.c (make_frame): Allow horizontal scroll bars in
mini windows.
(adjust_frame_size): Drop PIXELWISE argument in
'resize_frame_windows' calls.
* src/window.c (set_window_buffer): Don't override WINDOW's
scroll bar and fringe settings when marked as persistent.
(resize_frame_windows): Drop fourth argument PIXELWISE - SIZE
is always specified in terms of pixels.  Try to handle height
of mini windows more accurately.
(grow_mini_window, shrink_mini_window): Use body height of
mini window when calculating expected height change.  Take
horizontal scroll bars into account.
(struct saved_window): Two new members to handle persistence
of window fringes and scroll bars.
(Fset_window_configuration, save_window_save): Handle
persistence of fringes and scroll bars.
(set_window_fringes, set_window_scroll_bars): New arguments
PERSISTENT.  Make dimension checks more accurate.
(Fset_window_fringes): New argument PERSISTENT.
(Fwindow_fringes, Fwindow_scroll_bars): Add PERSISTENT to
return values.
(Fset_window_scroll_bars): New argument PERSISTENT.  In
doc-string mention that 'bottom' must be specified to get a
horizontal scroll bar in mini windows.
(compare_window_configurations): Add checks for persistence of
fringes and scroll bars.
* src/window.h (struct window): New boolean slots
'fringes_persistent' and 'scroll_bars_persistent'.
(WINDOW_HAS_HORIZONTAL_SCROLL_BAR): Allow horizontal scroll bars
for mini windows.
(resize_frame_windows): Remove fourth argument of
'resize_frame_windows' in external declaration.
* src/xdisp.c (resize_mini_window): Use box text height to
tell whether mini window height changed.
(set_horizontal_scroll_bar): Set mini window's horizontal
scroll bar when its type is specified as 'bottom'.
* etc/NEWS: Mention new options for 'set-window-fringes' and
'set-window-scroll-bars'.

1 files changed, 7 insertions, 11 deletions

diff --git a/src/frame.c b/src/frame.c
index 6363a873684..d94de417e4d 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -712,7 +712,7 @@ adjust_frame_size (struct frame *f, int new_width, int new_height, int inhibit,
 
   if (new_windows_width != old_windows_width)
     {
-      resize_frame_windows (f, new_windows_width, 1, 1);
+      resize_frame_windows (f, new_windows_width, true);
 
       /* MSDOS frames cannot PRETEND, as they change frame size by
          manipulating video hardware.  */
@@ -737,7 +737,7 @@ adjust_frame_size (struct frame *f, int new_width, int new_height, int inhibit,
          left edges.  */
       || WINDOW_TOP_PIXEL_EDGE (r) != FRAME_TOP_MARGIN_HEIGHT (f))
     {
-      resize_frame_windows (f, new_windows_height, 0, 1);
+      resize_frame_windows (f, new_windows_height, false);
 
       /* MSDOS frames cannot PRETEND, as they change frame size by
          manipulating video hardware.  */
@@ -931,15 +931,11 @@ make_frame (bool mini_p)
   }
 
   if (mini_p)
-    {
-      set_window_buffer (mini_window,
-                         (NILP (Vminibuffer_list)
-                          ? get_minibuffer (0)
-                          : Fcar (Vminibuffer_list)),
-                         0, 0);
-      /* No horizontal scroll bars in minibuffers.  */
-      wset_horizontal_scroll_bar (mw, Qnil);
-    }
+    set_window_buffer (mini_window,
+                       (NILP (Vminibuffer_list)
+                        ? get_minibuffer (0)
+                        : Fcar (Vminibuffer_list)),
+                       0, 0);
 
   fset_root_window (f, root_window);
   fset_selected_window (f, root_window);