Fix overtyping wide characters. - st - Personal fork of st
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       ---
 (DIR) commit 65f1dc428315ae9d7f362e10c668557c1379e7af
 (DIR) parent a0467c802d4f86ed162486e3453dd61181423902
 (HTM) Author: jamin <acdimalev@gmail.com>
       Date:   Wed, 29 Dec 2021 09:07:17 -0800
       
       Fix overtyping wide characters.
       
       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
       
       Diffstat:
         M st.c                                |       4 ++++
       
       1 file changed, 4 insertions(+), 0 deletions(-)
       ---
 (DIR) diff --git a/st.c b/st.c
       @@ -2507,6 +2507,10 @@ check_control_code:
                if (width == 2) {
                        gp->mode |= ATTR_WIDE;
                        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].mode = ATTR_WDUMMY;
                        }