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ded3f5ec83
This was an elusive bug caused by two upstream behaviors: 1. `kill-buffer` will silently refuse to kill a buffer if there is a thread associated with it. 2. `global-diff-hl-mode` activates `diff-hl-mode` in *most* buffers, even invisible ones. This calls `diff-hl-update` each time it does. This isn't a problem *unless* you have `diff-hl-update-async` enabled, because it creates a thread every time `diff-hl-update` is called. That means for every buffer -- real or transient -- you have a new thread queued. And this caused two main issues: 1. Temporary buffers are often opened and closed very rapidly (often faster than the thread can complete), so they weren't getting cleaned up. I hope you weren't too attached to your memory, because you'll have a lot of buried buffers to feed before long! 2. In cases where `diff-hl-update` simply takes a long time, multiple calls to it would queue more threads. When Emacs eventually yields the CPU to them, you'll get random, impossible-to-predict-or-track-down freezes. Joy! This may very well be enough reason to disable `diff-hl-update-async` by default, but I didn't want to give up on it *just* yet, despite how inelegant this solution is... Fix: #7954 Fix: #7991
:ui
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For modules concerned with changing Emacs' appearance or providing interfaces for its features, like sidebars, tabs, or fonts.
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