bug#62780: 30.0.50; Redisplay gets slow when using Org tables + show-trailing-whitespace

[Ihor Radchenko <yantar92@posteo.net>]

Eli Zaretskii <eliz@gnu.org> writes:

> But to test this idea, I need enough test cases that use the
> 'composition' property to make sure the property still works after I
> disable that call.  Can you collect a few test cases which use the
> 'composition' property, with or without Org tables?  I guess
> prettify-symbols-mode is one of them, but are there others?  I will
> then try to find time to test this idea.

1. The most obvious is prettify-symbols-mode in Emacs sources
   Say, (setq-local prettify-symbols-alist '(("!" . ?¬)) M-x
   prettify-symbols-mode

2. https://github.com/integral-dw/org-superstar-mode
   You can use tests/*.org example files
   Also, https://github.com/jdtsmith/shakespeare.org has a giant example
   Org file. And https://github.com/casouri/valign/blob/master/test.org
   has a number of example tables (though the package itself does not
   use composition).

3. Typing using TeX input method will produce composed glyphs. The same
   if you set org-pretty-entities to t and then type \alpha, \beta, etc
   in Org buffers.

4. Composing long spans of text might be a reasonable edge case to test.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
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