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From: | Gregory Heytings |
Subject: | bug#56682: Fix the long lines font locking related slowdowns |
Date: | Thu, 04 Aug 2022 11:21:23 +0000 |
By the way, playing with Alan's example here a bit... To recap, this is the test case (in a .cc file):--- char long_line[] = R"foo( )foo" ---If I insert a 1M long line there (with `C-y'), Emacs will hang indefinitely. Wasn't the long-line stuff supposed to trigger in these situations? Or is it hanging in some cc-mode stuff before we get that far?
No wonder. CC Mode is a slow mode, and one of the worst offenders here. In this cas, IIUC, what you see is because CC Mode adds c-after-change to after-change-functions, which has the effect that
(put-text-property 27 1000028 'face 'font-lock-string-face) is called no less than 1335 times after that C-y.
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