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patch 8.2.1345: Redraw error when using visual block and scroll

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Problem:    Redraw error when using visual block and scroll.
Solution:   Add check for w_topline. ( closes #6597)
This commit is contained in:
Bram Moolenaar
2020-08-01 19:14:13 +02:00
parent 2c79e9d14d
commit f8992d47cd
4 changed files with 38 additions and 3 deletions
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9
src/drawscreen.c
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@@ -1659,10 +1659,13 @@ win_update(win_T *wp)
#endif
)
{
if (mod_top != 0 && wp->w_topline == mod_top)
if (mod_top != 0
&& wp->w_topline == mod_top
&& (!wp->w_lines[0].wl_valid
|| wp->w_topline == wp->w_lines[0].wl_lnum))
{
// w_topline is the first changed line, the scrolling will be done
// further down.
// w_topline is the first changed line and window is not scrolled,
// the scrolling from changed lines will be done further down.
}
else if (wp->w_lines[0].wl_valid
&& (wp->w_topline < wp->w_lines[0].wl_lnum