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Fix for wide character being incorrectly cleared on MODE_INSERT

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Under insert mode, when inserting a normal character in front of
a wide character, the affected region is shifted to the right by
one cell. However, the empty cell is reset as if being a part of a
wide character, causing the following cell being mishandled as a
dummy cell.
To reproduce the bug:
	printf '\033[4h' # set MODE_INSERT
	printf 妳好
	printf '\033[4D'
	printf 'x'
	printf '\033[4l\n'

Ref.
https://git.suckless.org/st/commit/3a6d6d740110e6ee1b092d05ad746244eedabe4b.html
This commit is contained in:
Bakkeby 2023-06-25 14:19:27 +02:00
parent 677f854c05
commit b82057eb85
2 changed files with 4 additions and 2 deletions
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4
st.c
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@ -3244,8 +3244,10 @@ check_control_code:
gp = &term.line[term.c.y][term.c.x];
}
if (IS_SET(MODE_INSERT) && term.c.x+width < term.col)
if (IS_SET(MODE_INSERT) && term.c.x+width < term.col) {
memmove(gp+width, gp, (term.col - term.c.x - width) * sizeof(Glyph));
gp->mode &= ~ATTR_WIDE;
}
if (term.c.x+width > term.col) {
tnewline(1);