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From: | Noam Postavsky |
Subject: | bug#41200: Displaying a tooltip with x-show-tip gets very slow as more faces are defined |
Date: | Fri, 15 May 2020 11:33:40 -0400 |
User-agent: | Gnus/5.13 (Gnus v5.13) Emacs/26.3 (windows-nt) |
Eli Zaretskii <eliz@gnu.org> writes: >> Done for frame-face-alist. But how can one do a read-only variable? >> Using the new variable watchers facility? > > At the very least mention in the doc string. I don't think using > watchable symbols is needed here, it sounds gross. If there's an > outcry that this breaks too much code out there, we could revisit > this. You can use make_symbol_constant to make a variable read-only. You could also simulate it with a variable watcher that signals an error, but there's no sense in doing that when make_symbol_constant exists. Neither of these makes the list object itself read-only though.
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