st

commit 1b58ae4a6888390bf763febf6b25a4e8145ba57a
parent a62a336dda608967b4d54141163c2320569cb959
Author: Shi Tian <shitian@cock.li>
Date:   Sun, 25 Jun 2023 05:38:33 +0000

Fix for wide character being incorrectly cleared on MODE_INSERT

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'

Diffstat:
M
st.c
 | 
4
+++-

1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/st.c b/st.c
@@ -2471,8 +2471,10 @@ 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);