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'
---
st.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/st.c b/st.c
index a3d1697..8a9306a 100644
--- a/st.c
+++ b/st.c
@@ -2495,8 +2495,10 @@ 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);
--
2.29.2
