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grid: don’t cut multi-column chars in half when resizing the alt screen

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When we resize the alt screen, we don’t reflow the text, we simply
truncate all the lines.

When doing this, make sure we don’t truncate in the middle of a
multi-column character.
This commit is contained in:
Daniel Eklöf 2021-06-02 19:32:05 +02:00
parent 363aeea2df
commit b7709cc013
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GPG key ID: 5BBD4992C116573F
2 changed files with 7 additions and 1 deletions
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2
CHANGELOG.md
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@ -149,6 +149,8 @@
(https://codeberg.org/dnkl/foot/issues/565).
* Off-by-one error in markup of auto-detected URLs when the URL ends
in the right-most column.
* Multi-column characters being cut in half when resizing the
alternate screen.
### Security

6
grid.c
View file

@ -194,11 +194,15 @@ grid_resize_without_reflow(
new_row->dirty = old_row->dirty;
new_row->linebreak = false;
/* Clear "new" columns */
if (new_cols > old_cols) {
/* Clear "new" columns */
memset(&new_row->cells[old_cols], 0,
sizeof(struct cell) * (new_cols - old_cols));
new_row->dirty = true;
} else if (old_cols > new_cols) {
/* Make sure we don't cut a multi-column character in two */
for (int i = new_cols; i > 0 && old_row->cells[i].wc > CELL_SPACER; i--)
new_row->cells[i - 1].wc = 0;
}
/* Map sixels on current "old" row to current "new row" */