Problem: Cursor pos wrong when double-width chars are concealed.
Solution: Advance one more virtual column for a double-width char.
Run some tests with both 'wrap' and 'nowrap' (zeertzjq).
closes: #14197
Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
