Merge from trunk

1 files changed, 81 insertions, 64 deletions

diff --git a/src/window.c b/src/window.c
index 114bd28c310..61d2a8b073f 100644
--- a/src/window.c
+++ b/src/window.c
@@ -60,8 +60,7 @@ static Lisp_Object Qwindow_deletable_p, Qdelete_window, Qdisplay_buffer;
 static Lisp_Object Qreplace_buffer_in_windows, Qget_mru_window;
 static Lisp_Object Qwindow_resize_root_window, Qwindow_resize_root_window_vertically;
 static Lisp_Object Qscroll_up, Qscroll_down, Qscroll_command;
-static Lisp_Object Qsafe, Qabove, Qbelow;
-static Lisp_Object Qclone_of;
+static Lisp_Object Qsafe, Qabove, Qbelow, Qwindow_size, Qclone_of;
 
 static int displayed_window_lines (struct window *);
 static int count_windows (struct window *);
@@ -134,102 +133,102 @@ static EMACS_INT window_scroll_preserve_hpos;
 static EMACS_INT window_scroll_preserve_vpos;
 
 /* These setters are used only in this file, so they can be private.  */
-static inline void
+static void
 wset_combination_limit (struct window *w, Lisp_Object val)
 {
   w->combination_limit = val;
 }
-static inline void
+static void
 wset_dedicated (struct window *w, Lisp_Object val)
 {
   w->dedicated = val;
 }
-static inline void
+static void
 wset_display_table (struct window *w, Lisp_Object val)
 {
   w->display_table = val;
 }
-static inline void
+static void
 wset_hchild (struct window *w, Lisp_Object val)
 {
   w->hchild = val;
 }
-static inline void
+static void
 wset_left_fringe_width (struct window *w, Lisp_Object val)
 {
   w->left_fringe_width = val;
 }
-static inline void
+static void
 wset_left_margin_cols (struct window *w, Lisp_Object val)
 {
   w->left_margin_cols = val;
 }
-static inline void
+static void
 wset_new_normal (struct window *w, Lisp_Object val)
 {
   w->new_normal = val;
 }
-static inline void
+static void
 wset_new_total (struct window *w, Lisp_Object val)
 {
   w->new_total = val;
 }
-static inline void
+static void
 wset_normal_cols (struct window *w, Lisp_Object val)
 {
   w->normal_cols = val;
 }
-static inline void
+static void
 wset_normal_lines (struct window *w, Lisp_Object val)
 {
   w->normal_lines = val;
 }
-static inline void
+static void
 wset_parent (struct window *w, Lisp_Object val)
 {
   w->parent = val;
 }
-static inline void
+static void
 wset_pointm (struct window *w, Lisp_Object val)
 {
   w->pointm = val;
 }
-static inline void
+static void
 wset_right_fringe_width (struct window *w, Lisp_Object val)
 {
   w->right_fringe_width = val;
 }
-static inline void
+static void
 wset_right_margin_cols (struct window *w, Lisp_Object val)
 {
   w->right_margin_cols = val;
 }
-static inline void
+static void
 wset_scroll_bar_width (struct window *w, Lisp_Object val)
 {
   w->scroll_bar_width = val;
 }
-static inline void
+static void
 wset_start (struct window *w, Lisp_Object val)
 {
   w->start = val;
 }
-static inline void
+static void
 wset_temslot (struct window *w, Lisp_Object val)
 {
   w->temslot = val;
 }
-static inline void
+static void
 wset_vchild (struct window *w, Lisp_Object val)
 {
   w->vchild = val;
 }
-static inline void
+static void
 wset_vertical_scroll_bar_type (struct window *w, Lisp_Object val)
 {
   w->vertical_scroll_bar_type = val;
 }
-static inline void
+static void
 wset_window_parameters (struct window *w, Lisp_Object val)
 {
   w->window_parameters = val;
@@ -613,10 +612,10 @@ WINDOW are never \(re-)combined with WINDOW's siblings.  */)
 DEFUN ("set-window-combination-limit", Fset_window_combination_limit, Sset_window_combination_limit, 2, 2, 0,
        doc: /* Set combination limit of window WINDOW to LIMIT; return LIMIT.
 WINDOW must be a valid window and defaults to the selected one.
-If LIMIT is nil, child windows of WINDOW can be recombined with
-WINDOW's siblings.  LIMIT t means that child windows of WINDOW are
-never \(re-)combined with WINDOW's siblings.  Other values are reserved
-for future use.  */)
+If LIMIT is nil, child windows of WINDOW can be recombined with WINDOW's
+siblings.  LIMIT t means that child windows of WINDOW are never
+\(re-)combined with WINDOW's siblings.  Other values are reserved for
+future use.  */)
   (Lisp_Object window, Lisp_Object limit)
 {
   wset_combination_limit (decode_valid_window (window), limit);
@@ -2820,7 +2819,7 @@ window-start value is reasonable when this function is called.  */)
         }
     }
 
-  BLOCK_INPUT;
+  block_input ();
   if (!FRAME_INITIAL_P (f))
     {
         Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (f);
@@ -2962,7 +2961,7 @@ window-start value is reasonable when this function is called.  */)
     }
 
   adjust_glyphs (f);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   run_window_configuration_change_hook (f);
 
@@ -3462,6 +3461,10 @@ make_window (void)
   wset_vertical_scroll_bar_type (w, Qt);
   wset_window_end_pos (w, make_number (0));
   wset_window_end_vpos (w, make_number (0));
+  /* These Lisp fields are marked specially so they're not set to nil by
+     allocate_window.  */
+  wset_prev_buffers (w, Qnil);
+  wset_next_buffers (w, Qnil);
 
   /* Initialize non-Lisp data.  Note that allocate_window zeroes out all
      non-Lisp data, so do it only for slots which should not be zero.  */
@@ -3693,14 +3696,14 @@ be applied on the Elisp level.  */)
                (horflag ? r->total_cols : r->total_lines)))
     return Qnil;
 
-  BLOCK_INPUT;
+  block_input ();
   window_resize_apply (r, horflag);
 
   windows_or_buffers_changed++;
   FRAME_WINDOW_SIZES_CHANGED (f) = 1;
 
   adjust_glyphs (f);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   run_window_configuration_change_hook (f);
 
@@ -3844,7 +3847,7 @@ set correctly.  See the code of `split-window' for how this is done.  */)
      We do that if either `window-combination-limit' is t, or OLD has no
      parent, or OLD is ortho-combined.  */
   combination_limit =
-    !NILP (Vwindow_combination_limit)
+    EQ (Vwindow_combination_limit, Qt)
     || NILP (o->parent)
     || NILP (horflag
              ? (XWINDOW (o->parent)->hchild)
@@ -3899,9 +3902,9 @@ set correctly.  See the code of `split-window' for how this is done.  */)
 
       make_parent_window (old, horflag);
       p = XWINDOW (o->parent);
-      /* Store value of `window-combination-limit' in new parent's
-         combination_limit slot.  */
-      wset_combination_limit (p, Vwindow_combination_limit);
+      /* Store t in the new parent's combination_limit slot to avoid
+        that its children get merged into another window.  */
+      wset_combination_limit (p, Qt);
       /* These get applied below.  */
       wset_new_total (p, horflag ? o->total_cols : o->total_lines);
       wset_new_normal (p, new_normal);
@@ -3970,13 +3973,13 @@ set correctly.  See the code of `split-window' for how this is done.  */)
   wset_new_total (n, total_size);
   wset_new_normal (n, normal_size);
 
-  BLOCK_INPUT;
+  block_input ();
   window_resize_apply (p, horflag);
   adjust_glyphs (f);
   /* Set buffer of NEW to buffer of reference window.  Don't run
      any hooks.  */
   set_window_buffer (new, r->buffer, 0, 1);
-  UNBLOCK_INPUT;
+  unblock_input ();
 
   /* Maybe we should run the scroll functions in Elisp (which already
      runs the configuration change hook).  */
@@ -4057,7 +4060,7 @@ Signal an error when WINDOW is the only window on its frame.  */)
     {
 
       /* Block input.  */
-      BLOCK_INPUT;
+      block_input ();
       window_resize_apply (p, horflag);
 
       /* If this window is referred to by the dpyinfo's mouse
@@ -4129,7 +4132,7 @@ Signal an error when WINDOW is the only window on its frame.  */)
           else
             fset_selected_window (f, new_selected_window);
 
-          UNBLOCK_INPUT;
+          unblock_input ();
 
           /* Now look whether `get-mru-window' gets us something.  */
           mru_window = call1 (Qget_mru_window, frame);
@@ -4144,7 +4147,7 @@ Signal an error when WINDOW is the only window on its frame.  */)
             fset_selected_window (f, new_selected_window);
         }
       else
-        UNBLOCK_INPUT;
+        unblock_input ();
 
       /* Must be run by the caller:
          run_window_configuration_change_hook (f);  */
@@ -4194,7 +4197,7 @@ grow_mini_window (struct window *w, int delta)
                  root, make_number (- delta));
   if (INTEGERP (value) && window_resize_check (r, 0))
     {
-      BLOCK_INPUT;
+      block_input ();
       window_resize_apply (r, 0);
 
       /* Grow the mini-window.  */
@@ -4206,7 +4209,7 @@ grow_mini_window (struct window *w, int delta)
       w->last_overlay_modified = 0;
 
       adjust_glyphs (f);
-      UNBLOCK_INPUT;
+      unblock_input ();
     }
 }
 
@@ -4231,7 +4234,7 @@ shrink_mini_window (struct window *w)
                      root, make_number (size - 1));
       if (INTEGERP (value) && window_resize_check (r, 0))
         {
-          BLOCK_INPUT;
+          block_input ();
           window_resize_apply (r, 0);
 
           /* Shrink the mini-window.  */
@@ -4243,7 +4246,7 @@ shrink_mini_window (struct window *w)
           w->last_overlay_modified = 0;
 
           adjust_glyphs (f);
-          UNBLOCK_INPUT;
+          unblock_input ();
         }
       /* If the above failed for whatever strange reason we must make a
          one window frame here.  The same routine will be needed when
@@ -4275,7 +4278,7 @@ DEFUN ("resize-mini-window-internal", Fresize_mini_window_internal, Sresize_mini
       && XINT (w->new_total) > 0
       && height == XINT (r->new_total) + XINT (w->new_total))
     {
-      BLOCK_INPUT;
+      block_input ();
       window_resize_apply (r, 0);
 
       wset_total_lines (w, w->new_total);
@@ -4285,7 +4288,7 @@ DEFUN ("resize-mini-window-internal", Fresize_mini_window_internal, Sresize_mini
       windows_or_buffers_changed++;
       FRAME_WINDOW_SIZES_CHANGED (f) = 1;
       adjust_glyphs (f);
-      UNBLOCK_INPUT;
+      unblock_input ();
 
       run_window_configuration_change_hook (f);
       return Qt;
@@ -5621,7 +5624,7 @@ the return value is nil.  Otherwise the value is t.  */)
 
       /* The mouse highlighting code could get screwed up
          if it runs during this.  */
-      BLOCK_INPUT;
+      block_input ();
 
       if (data->frame_lines != previous_frame_lines
           || data->frame_cols != previous_frame_cols)
@@ -5872,7 +5875,7 @@ the return value is nil.  Otherwise the value is t.  */)
         }
 
       adjust_glyphs (f);
-      UNBLOCK_INPUT;
+      unblock_input ();
 
       /* Scan dead buffer windows.  */
       for (; CONSP (dead_windows); dead_windows = XCDR (dead_windows))
@@ -6701,6 +6704,7 @@ syms_of_window (void)
   DEFSYM (Qreplace_buffer_in_windows, "replace-buffer-in-windows");
   DEFSYM (Qrecord_window_buffer, "record-window-buffer");
   DEFSYM (Qget_mru_window, "get-mru-window");
+  DEFSYM (Qwindow_size, "window-size");
   DEFSYM (Qtemp_buffer_show_hook, "temp-buffer-show-hook");
   DEFSYM (Qabove, "above");
   DEFSYM (Qbelow, "below");
@@ -6796,23 +6800,36 @@ This variable takes no effect if `window-combination-limit' is non-nil.  */);
   Vwindow_combination_resize = Qnil;
 
   DEFVAR_LISP ("window-combination-limit", Vwindow_combination_limit,
-               doc: /* If t, splitting a window makes a new parent window.
-If this variable is nil, splitting a window will create a new parent
-window only if the window has no parent window or the window shall
-become a combination orthogonal to the one it is part of.
-
-If this variable is t, splitting a window always creates a new parent
-window.  If all splits behave this way, each frame's window tree is a
-binary tree and every window but the frame's root window has exactly one
-sibling.
-
-Other values are reserved for future use.
-
-The value of this variable is also assigned to the combination limit of
-the new parent window.  The combination limit of a window can be
-retrieved via the function `window-combination-limit' and altered by the
-function `set-window-combination-limit'.  */);
-  Vwindow_combination_limit = Qnil;
+               doc: /* If non-nil, splitting a window makes a new parent window.
+The following values are recognized:
+
+nil means splitting a window will create a new parent window only if the
+    window has no parent window or the window shall become part of a
+    combination orthogonal to the one it is part of.
+
+`window-size' means that splitting a window for displaying a buffer
+    makes a new parent window provided `display-buffer' is supposed to
+    explicitly set the window's size due to the presence of a
+    `window-height' or `window-width' entry in the alist used by
+    `display-buffer'.  Otherwise, this value is handled like nil.
+
+`temp-buffer' means that splitting a window for displaying a temporary
+    buffer always makes a new parent window.  Otherwise, this value is
+    handled like nil.
+
+`display-buffer' means that splitting a window for displaying a buffer
+    always makes a new parent window.  Since temporary buffers are
+    displayed by the function `display-buffer', this value is stronger
+    than `temp-buffer'.  Splitting a window for other purpose makes a
+    new parent window only if needed.
+
+t means that splitting a window always creates a new parent window.  If
+    all splits behave this way, each frame's window tree is a binary
+    tree and every window but the frame's root window has exactly one
+    sibling.
+
+Other values are reserved for future use.  */);
+  Vwindow_combination_limit = Qwindow_size;
 
   DEFVAR_LISP ("window-persistent-parameters", Vwindow_persistent_parameters,
                doc: /* Alist of persistent window parameters.