Fix for wide character being incorrectly cleared on MODE_INSERT - st - personal variant of st
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       ---
 (DIR) commit 3a6d6d740110e6ee1b092d05ad746244eedabe4b
 (DIR) parent 211964d56ee00a7d46e251cbc150afb79138ae37
 (HTM) 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(-)
       ---
 (DIR) 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);