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fix(smoothscroll): crash when resizing to textoff with showbreak

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vim-patch:9.2.0362: division by zero with smoothscroll and small windows

Problem:  Resizing a smoothscrolled wrapped window to its textoff width
          with 'showbreak' can leave wrapped continuation lines with
          zero text width. win_lbr_chartabsize() still runs the partial max_head_vcol calculation in
          that state and divides by width2, crashing during redraw.
Solution: Skip that partial head calculation when the wrapped
          continuation width is zero, matching the other width2 guards
          in charset.c (Jaehwang Jung)

closes: vim/vim#20012

AI-assisted: Codex

0e31fb024c
(cherry picked from commit 79a7a4abe1)
This commit is contained in:
Jaehwang Jung
2026-04-19 02:16:31 +09:00
committed by github-actions[bot]
parent 9966afbc9d
commit 898ccbc68a
3 changed files with 57 additions and 1 deletions
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2
src/nvim/plines.c
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@@ -269,7 +269,7 @@ CharSize charsize_regular(CharsizeArg *csarg, char *const cur, colnr_T const vco
if (max_head_vcol == 0 || vcol + size + added < max_head_vcol) {
head += cnt * head_mid;
} else if (max_head_vcol > vcol + head_prev + prev_rem) {
} else if (width2 > 0 && max_head_vcol > vcol + head_prev + prev_rem) {
head += (max_head_vcol - (vcol + head_prev + prev_rem)
+ width2 - 1) / width2 * head_mid;
} else if (max_head_vcol < 0) {