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bug#42522: Emacs 27: 100% CPU when setting mode-name with ligatures
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From: |
Eli Zaretskii |
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Subject: |
bug#42522: Emacs 27: 100% CPU when setting mode-name with ligatures |
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Date: |
Sat, 25 Jul 2020 09:24:47 +0300 |
> From: Evan Moses <emoses@gmail.com>
> Date: Fri, 24 Jul 2020 14:35:50 -0700
>
> To reproduce, evaluate this
>
> (set-char-table-range composition-function-table 47
> '([".\\(?:\\(?:\\*\\*\\|//\\|==\\)\\|[*/=>]\\)" 0
> font-shape-gstring]))
>
> And then evaluate
>
> (setq mode-name "test//")
>
> Emacs will become unresponsive and consume 100% CPU.
It doesn't hang here. Could this be macOS-specific? Or maybe the
problem happens only with some fonts? Does it happen in "emacs -Q"?
In any case, did you really mean for Emacs to produce ligatures on the
mode line? More generally, what kind of ligatures are you trying to
produce with this setup?