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Fix assertion violations in try_window_id (Bug#19511)

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src/xdisp.c (move_it_to, try_cursor_movement): Don't use the window
 end information if the window_end_valid flag is unset.
 (try_window_id): If the call to display_line invalidated the
 window end information, give up the try_window_id optimization.
This commit is contained in:
Eli Zaretskii 2015-01-05 17:42:55 +02:00
parent 031eadcbed
commit d279e66808
2 changed files with 26 additions and 1 deletions
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8
src/ChangeLog
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@ -1,3 +1,11 @@
2015-01-05 Eli Zaretskii <eliz@gnu.org>
* xdisp.c (move_it_to, try_cursor_movement): Don't use the window
end information if the window_end_valid flag is unset.
(try_window_id): If the call to display_line invalidated the
window end information, give up the try_window_id optimization.
(Bug#19511)
2015-01-04 Eli Zaretskii <eliz@gnu.org>
* w32fns.c (Fx_server_version, Fx_server_vendor): Doc fix.

19
src/xdisp.c
View file

@ -9379,6 +9379,7 @@ move_it_to (struct it *it, ptrdiff_t to_charpos, int to_x, int to_y, int to_vpos
&& it->current_x == it->last_visible_x - 1
&& it->c != '\n'
&& it->c != '\t'
&& it->w->window_end_valid
&& it->vpos < it->w->window_end_vpos)
{
it->continuation_lines_width += it->current_x;
@ -15521,7 +15522,8 @@ try_cursor_movement (Lisp_Object window, struct text_pos startp, int *scroll_ste
/* Likewise there was a check whether window_end_vpos is nil or larger
than the window. Now window_end_vpos is int and so never nil, but
let's leave eassert to check whether it fits in the window. */
eassert (w->window_end_vpos < w->current_matrix->nrows);
eassert (!w->window_end_valid
|| w->window_end_vpos < w->current_matrix->nrows);
/* Handle case where text has not changed, only point, and it has
not moved off the frame. */
@ -18185,6 +18187,21 @@ try_window_id (struct window *w)
if (f->fonts_changed)
return -1;
/* The redisplay iterations in display_line above could have
triggered font-lock, which could have done something that
invalidates IT->w window's end-point information, on which we
rely below. E.g., one package, which will remain unnamed, used
to install a font-lock-fontify-region-function that called
bury-buffer, whose side effect is to switch the buffer displayed
by IT->w, and that predictably resets IT->w's window_end_valid
flag, which we already tested at the entry to this function.
Amply punish such packages/modes by giving up on this
optimization in those cases. */
if (!w->window_end_valid)
{
clear_glyph_matrix (w->desired_matrix);
return -1;
}
/* Compute differences in buffer positions, y-positions etc. for
lines reused at the bottom of the window. Compute what we can