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patch 9.0.1664: divide by zero when scrolling with 'smoothscroll' set

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Problem:    Divide by zero when scrolling with 'smoothscroll' set.
Solution:   Avoid using a negative width. (closes #12540, closes #12528)
This commit is contained in:
fullwaywang
2023-06-24 21:58:09 +01:00
committed by Bram Moolenaar
parent c9a4a8ab28
commit 8154e642aa
4 changed files with 58 additions and 10 deletions
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23
src/move.c
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@@ -2591,17 +2591,20 @@ scroll_cursor_bot(int min_scroll, int set_topbot)
(curwin, curwin->w_topline, FALSE);
int skip_lines = 0;
int width1 = curwin->w_width - curwin_col_off();
int width2 = width1 + curwin_col_off2();
// similar formula is used in curs_columns()
if (curwin->w_skipcol > width1)
skip_lines += (curwin->w_skipcol - width1) / width2 + 1;
else if (curwin->w_skipcol > 0)
skip_lines = 1;
top_plines -= skip_lines;
if (top_plines > curwin->w_height)
if (width1 > 0)
{
scrolled += (top_plines - curwin->w_height);
int width2 = width1 + curwin_col_off2();
// similar formula is used in curs_columns()
if (curwin->w_skipcol > width1)
skip_lines += (curwin->w_skipcol - width1) / width2 + 1;
else if (curwin->w_skipcol > 0)
skip_lines = 1;
top_plines -= skip_lines;
if (top_plines > curwin->w_height)
{
scrolled += (top_plines - curwin->w_height);
}
}
}
}