GNU bug report logs - #67925
29.1; delete-rectangle fails on multi-column characters

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From: Juri Linkov <juri <at> linkov.net>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 67925 <at> debbugs.gnu.org, Stefan Kangas <stefankangas <at> gmail.com>, awrhygty <at> outlook.com
Subject: bug#67925: 29.1; delete-rectangle fails on multi-column characters
Date: Sat, 23 Dec 2023 19:30:03 +0200

[Message part 1 (text/plain, inline)]

>> Does the same problem exist for deleting rectangles in texts
>> with a variable-pitch font?
>
> No, with variable pitch fonts there is also a problem but it's
> a different one.  Basically the rectangle commands operate by pretending
> your font is monospaced.  You can see it with the rectangle highlighting
> of `C-x SPC` where the "rectangle" won't be very rectangular in the
> presence of variable pitch fonts.
>
> For such cases, it's not even clear what The Right Thing™ should be.

I tried "Block Area Selection" in LibreOffice with variable pitch fonts,
and the vertical lines are not straight:

[rect_libre.png (image/png, inline)]

[Message part 3 (text/plain, inline)]

So maybe it's impossible to draw straight rectangle boundaries.

OTOH, with monospaced fonts LibreOffice selects such Block Area
on the reported text:

[mono_libre.png (image/png, inline)]

[Message part 5 (text/plain, inline)]

and DEL deletes the selected text.  So maybe Emacs should do the same.

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