bug#67925: 29.1; delete-rectangle fails on multi-column characters

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: Eli Zaretskii <eliz@gnu.org>,  awrhygty@outlook.com,  Stefan Kangas
>  <stefankangas@gmail.com>,  67925@debbugs.gnu.org
> Date: Sat, 23 Dec 2023 19:30:03 +0200
> 
> OTOH, with monospaced fonts LibreOffice selects such Block Area
> on the reported text:
> 
> 
> and DEL deletes the selected text.  So maybe Emacs should do the same.

The patch I posted in

  https://debbugs.gnu.org/cgi/bugreport.cgi?bug=67925#8

is supposed to do precisely that (and does it at least in this simple
example).