GNU bug report logs - #72830
Big rectangular selections are slow

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From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: 72830 <at> debbugs.gnu.org
Cc: mattias.engdegard <at> gmail.com, eliz <at> gnu.org, monnier <at> iro.umontreal.ca, juri <at> linkov.net
Subject: bug#72830: Big rectangular selections are slow
Date: Thu, 29 Aug 2024 05:56:27 +0200

Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs <at> gnu.org> writes:

> There are further issues when several windows display the buffer.  🙂

Is it that bad?  Currently the overlays used for rectangle visualizing
specify a window overlay property.  Only one window gets updated now.


My idea would be: highlight from or up to "rectangle point" maximally
(window-height) lines.  Then the visual appearance is the same as now
(right?), and when the user moves point or selects a different window,
AFAIU the rectangle needs to be redrawn anyway.


Michael.

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