From: Nicolas Pitre <npitre@xxxxxxxxxxxx>
In the Unicode screen buffer, we follow double-width code points with a
space to maintain proper column alignment. This, however, creates
semantic problems when e.g. using cut and paste.
Let's use a better code point for the column padding's purpose i.e. a
zero-width space rather than a full space. This way the combination
remains with a width of 2.
Signed-off-by: Nicolas Pitre <npitre@xxxxxxxxxxxx>