Attempt to make redisplay more selective when changing fonts.

* frame.h (struct frame): New bitfield fonts_changed.
* dispextern.h (fonts_changed_p, adjust_glyphs): Remove declaration.
(adjust_frame_glyphs): Add prototype.
* dispnew.c (fonts_changed_p): Remove.
(adjust_glyphs): Remove becase we do not
adjust matrices on all frames at once any more.
(adjust_frame_glyphs): Block and unblock input here.
(adjust_glyph_matrix): Use fonts_changed.
(change_frame_size_1): Use adjust_frame_glyphs.
* font.c (font_open_entity): Use fonts_changed.
* frame.c (set_menu_bar_lines, Fmake_terminal_frame):
* w32fns.c (x_set_menu_bar_lines, x_set_tool_bar_lines, Fx_show_tip):
* window.c (Fdelete_other_windows_internal, Fwindow_resize_apply)
(Fsplit_window_internal, Fdelete_window_internal, grow_mini_window)
(shrink_mini_window, Fresize_mini_window_internal)
(window_scroll_pixel_based, Fset_window_configuration)
(apply_window_adjustment, Fset_window_vscroll):
* xfns.c (x_set_menu_bar_lines, x_set_tool_bar_lines, Fx_show_tip):
Use adjust_frame_glyphs.
* xdisp.c (redisplay_tool_bar, redisplay_window, try_window)
(try_window_reusing_current_matrix, try_window_id, display_line)
(IT_EXPAND_MATRIX_WIDTH): Use fonts_changed.
(redisplay_internal): Consider fonts_changed and adjust frame
matrices for each frame only if the frame is visible.  If font
has been changed on some frame during full redisplay, retry
only visible frames where the font has been actually changed.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/frame.h b/src/frame.h
index 17b6089120..3c7499ea81 100644
--- a/src/frame.h
+++ b/src/frame.h
@@ -210,6 +210,10 @@ struct frame
   unsigned external_tool_bar : 1;
 #endif
 
+  /* Nonzero means that fonts have been loaded since the last glyph
+     matrix adjustments.  */
+  unsigned fonts_changed : 1;
+
   /* Margin at the top of the frame.  Used to display the tool-bar.  */
   int tool_bar_lines;