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Fix overtyping wide characters.

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Overtyping the first half of a wide character with the
second half of a wide character results in display garbage.
This is because the trailing dummy is not cleaned up.

i.e.  ATTR_WIDE, ATTR_WDUMMY, ATTR_WDUMMY

Here is a short script for demonstrating the behavior:

	#!/bin/sh
	alias printf=/usr/bin/printf
	printf こんにちは！; sleep 2
	printf '\x1b[5D'; sleep 2
	printf へ; sleep 2
	printf ' '; sleep 2
	echo
This commit is contained in:
jamin 2021-12-29 09:07:17 -08:00 committed by Hiltjo Posthuma
parent a0467c802d
commit 65f1dc4283
1 changed files with 4 additions and 0 deletions
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st.c
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@ -2507,6 +2507,10 @@ check_control_code:
if (width == 2) { if (width == 2) {
gp->mode |= ATTR_WIDE; gp->mode |= ATTR_WIDE;
if (term.c.x+1 < term.col) { if (term.c.x+1 < term.col) {
if (gp[1].mode == ATTR_WIDE && term.c.x+2 < term.col) {
gp[2].u = ' ';
gp[2].mode &= ~ATTR_WDUMMY;
}
gp[1].u = '\0'; gp[1].u = '\0';
gp[1].mode = ATTR_WDUMMY; gp[1].mode = ATTR_WDUMMY;
} }