Be more careful if selected window shows the buffer other than current,

use window_outdated only if this is not so.  This change should also
address some weird issues discussed in Bug#13012.
* window.h (window_outdated): New prototype.
* window.c (window_outdated): Now here.  Convert from static and
always assume window's buffer.
(Fwindow_end, Fwindow_line_height): Use it.
* xdisp.c (reconsider_clip_changes): Remove prototype, drop 2nd arg
and always assume window's buffer.
(redisplay_window): Adjust user.
(redisplay_internal): Call to reconsider_clip_change once and
check whether mode line should be updated only if selected window
shows current buffer.
(run_window_scroll_functions): Use eassert for debugging check.
(Fmove_point_visually, note_mouse_highlight): Use window_outdated.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/window.h b/src/window.h
index 5da6165c48d..24949e1e287 100644
--- a/src/window.h
+++ b/src/window.h
@@ -973,6 +973,7 @@ extern void replace_buffer_in_windows (Lisp_Object);
 extern void replace_buffer_in_windows_safely (Lisp_Object);
 /* This looks like a setter, but it is a bit special.  */
 extern void wset_buffer (struct window *, Lisp_Object);
+extern bool window_outdated (struct window *);
 extern void init_window_once (void);
 extern void init_window (void);
 extern void syms_of_window (void);