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vim-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 vim/vim#12540, closes vim/vim#12528)

8154e642aa

Co-authored-by: fullwaywang <fullwaywang@tencent.com>
This commit is contained in:
zeertzjq
2023-06-25 08:15:45 +08:00
parent 0ca2d11c1f
commit 3b6fb3fefd
3 changed files with 78 additions and 10 deletions
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22
src/nvim/move.c
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@@ -1954,17 +1954,19 @@ void scroll_cursor_bot(int min_scroll, int set_topbot)
int top_plines = plines_win_nofill(curwin, curwin->w_topline, false);
int skip_lines = 0;
int width1 = curwin->w_width_inner - 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;
}
if (width1 > 0) {
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_inner) {
scrolled += (top_plines - curwin->w_height_inner);
top_plines -= skip_lines;
if (top_plines > curwin->w_height_inner) {
scrolled += (top_plines - curwin->w_height_inner);
}
}
}
}