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(redisplay_window): If current window start is not at the

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beginning of a line, select a new window start if buffer is modified
and window start is in the modified region, but the first change is
before window start.
This commit is contained in:
Kim F. Storm 2006-04-19 23:20:21 +00:00
parent 7f32b80b11
commit e221c49a0a
1 changed files with 27 additions and 0 deletions
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27
src/xdisp.c
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@ -12860,6 +12860,33 @@ redisplay_window (window, just_this_one_p)
|| (XFASTINT (w->last_modified) >= MODIFF
&& XFASTINT (w->last_overlay_modified) >= OVERLAY_MODIFF)))
{
/* If first window line is a continuation line, and window start
is inside the modified region, but the first change is before
current window start, we must select a new window start.*/
if (NILP (w->start_at_line_beg))
{
/* Make sure beg_unchanged and end_unchanged are up to date.
Do it only if buffer has really changed. This may or may
not have been done by try_window_id (see which) already. */
if (MODIFF > SAVE_MODIFF
/* This seems to happen sometimes after saving a buffer. */
|| BEG_UNCHANGED + END_UNCHANGED > Z_BYTE)
{
if (GPT - BEG < BEG_UNCHANGED)
BEG_UNCHANGED = GPT - BEG;
if (Z - GPT < END_UNCHANGED)
END_UNCHANGED = Z - GPT;
}
if (CHARPOS (startp) > BEG + BEG_UNCHANGED
&& CHARPOS (startp) <= Z - END_UNCHANGED)
{
centering_position = 0;
goto recenter;
}
}
#if GLYPH_DEBUG
debug_method_add (w, "same window start");
#endif