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bug#29889: 27.0.50; Slow visual selection
From: |
Eli Zaretskii |
Subject: |
bug#29889: 27.0.50; Slow visual selection |
Date: |
Fri, 29 Dec 2017 11:04:01 +0200 |
> From: Sujith <m.sujith@gmail.com>
> Date: Fri, 29 Dec 2017 09:22:22 +0530
>
> Visual selection of text becomes very slow and hogs the
> CPU in some cases.
>
> For example, open the file lisp/progmodes/vhdl-mode.el in
> the emacs codebase. And then, to reproduce this issue:
>
> * Scroll patiently to the bottom using C-v.
> (this is essential, jumping to the bottom doesn't seem to bring
> up this issue).
> * Set mark with C-SPC.
> * Go to the beginning with M-<.
> * Now move the cursor up and down.
>
> The selection is jerky and CPU usage is very high.
> I have tried this with emacs -Q and can see the issue. I am using
> the master branch.
Confirmed. Additional info:
This happens also on the emacs-26 branch and in the 26.0.90 pretest,
but not in Emacs 25.2.
It also isn't limited to *.el files: I see it with, e.g., xterm.c.
The painfully slow first step can be replaced with this much simpler
step:
M-: (font-lock-fontify-region (point-min) (point-max)) RET
I guess some bisecting is in order.
- bug#29889: 27.0.50; Slow visual selection, Sujith, 2017/12/28
- bug#29889: 27.0.50; Slow visual selection,
Eli Zaretskii <=
- bug#29889: 27.0.50; Slow visual selection, Sujith, 2017/12/29
- bug#29889: 27.0.50; Slow visual selection, Eli Zaretskii, 2017/12/30
- bug#29889: 27.0.50; Slow visual selection, Sujith, 2017/12/31
- bug#29889: 27.0.50; Slow visual selection, Eli Zaretskii, 2017/12/31
- bug#29889: 27.0.50; Slow visual selection, Eli Zaretskii, 2017/12/31
- bug#29889: 27.0.50; Slow visual selection, Sujith, 2017/12/31
- bug#29889: 27.0.50; Slow visual selection, Eli Zaretskii, 2017/12/31
- bug#29889: 27.0.50; Slow visual selection, Eli Zaretskii, 2017/12/31