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bug#8020: 23.2.93; assertion failure on fast frame resize
From: |
Eli Zaretskii |
Subject: |
bug#8020: 23.2.93; assertion failure on fast frame resize |
Date: |
Sat, 12 Feb 2011 10:50:49 +0200 |
> Date: Sat, 12 Feb 2011 11:30:28 +0900
> From: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
> Cc:
>
> This is forked from Bug#7348, and some analysis can be found there.
> (http://debbugs.gnu.org/cgi/bugreport.cgi?bug=7348)
>
> Steps to reproduce:
>
> 1. Build emacs with --enable-checking
> 2. emacs -Q
> 3. C-x 2
> 4. Move your mouse to the corner of the frame, grab it, drag up,
> rescaling the vertically to minimum size
>
> Result:
>
> ../src/xdisp.c:11515: Emacs fatal error: assertion failed: BUFFERP(w->buffer)
>
> The value of w->buffer was nil when the assertion failure occurred.
Please try the patch below, which is based on the discussions in bug
#7348. The patch seems to solve the bug on MS-Windows. If it works
for you on another platform, and doesn't cause problems elsewhere, I
will install it on the emacs-23 branch.
Thanks.
--- src/xdisp.c.orig 2011-01-26 20:15:42.000000000 +0200
+++ src/xdisp.c 2011-02-12 10:48:56.296875000 +0200
@@ -11261,6 +11261,7 @@
int preserve_echo_area;
{
struct window *w = XWINDOW (selected_window);
+ struct window *sw;
struct frame *f;
int pause;
int must_finish = 0;
@@ -11331,6 +11332,9 @@
}
retry:
+ /* Remember the currently selected window. */
+ sw = w;
+
if (!EQ (old_frame, selected_frame)
&& FRAME_LIVE_P (XFRAME (old_frame)))
/* When running redisplay, we play a bit fast-and-loose and allow e.g.
@@ -11396,6 +11400,14 @@
/* Notice any pending interrupt request to change frame size. */
do_pending_window_change (1);
+ /* do_pending_window_change could change the selected_window due to
+ frame resizing which makes the selected window too small. */
+ if (WINDOWP (selected_window) && (w = XWINDOW (selected_window)) != sw)
+ {
+ sw = w;
+ reconsider_clip_changes (w, current_buffer);
+ }
+
/* Clear frames marked as garbaged. */
if (frame_garbaged)
clear_garbaged_frames ();
@@ -11665,6 +11677,10 @@
if (!must_finish)
{
do_pending_window_change (1);
+ /* If selected_window changed, redisplay again. */
+ if (WINDOWP (selected_window)
+ && (w = XWINDOW (selected_window)) != sw)
+ goto retry;
/* We used to always goto end_of_redisplay here, but this
isn't enough if we have a blinking cursor. */
@@ -11959,8 +11975,9 @@
do_pending_window_change (1);
/* If we just did a pending size change, or have additional
- visible frames, redisplay again. */
- if (windows_or_buffers_changed && !pause)
+ visible frames, or selected_window changed, redisplay again. */
+ if ((windows_or_buffers_changed && !pause)
+ || (WINDOWP (selected_window) && (w = XWINDOW (selected_window)) != sw))
goto retry;
/* Clear the face cache eventually. */