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fix(display): scroll logic does not take into account concealed topline (#33054)

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(cherry picked from commit ce0c0c31a0)
This commit is contained in:
luukvbaal
2025-03-27 12:51:57 +01:00
committed by github-actions[bot]
parent ccb078bbb0
commit 2cd735d159
2 changed files with 35 additions and 3 deletions
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16
src/nvim/drawscreen.c
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@@ -1700,6 +1700,16 @@ static void win_update(win_T *wp)
}
}
// Below logic compares wp->w_topline against wp->w_lines[0].wl_lnum,
// which may point to a line below wp->w_topline if it is concealed;
// incurring scrolling even though wp->w_topline is still the same.
// Compare against an adjusted topline instead:
linenr_T topline_conceal = wp->w_topline;
while (decor_conceal_line(wp, topline_conceal - 1, false)) {
topline_conceal++;
hasFolding(wp, topline_conceal, NULL, &topline_conceal);
}
// If there are no changes on the screen that require a complete redraw,
// handle three cases:
// 1: we are off the top of the screen by a few lines: scroll down
@@ -1712,12 +1722,12 @@ static void win_update(win_T *wp)
if (mod_top != 0
&& wp->w_topline == mod_top
&& (!wp->w_lines[0].wl_valid
|| wp->w_topline == wp->w_lines[0].wl_lnum)) {
|| topline_conceal == wp->w_lines[0].wl_lnum)) {
// 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
|| (wp->w_topline == wp->w_lines[0].wl_lnum
&& (topline_conceal < wp->w_lines[0].wl_lnum
|| (topline_conceal == wp->w_lines[0].wl_lnum
&& wp->w_topfill > wp->w_old_topfill))) {
// New topline is above old topline: May scroll down.
int j;