bug#59208: 29.0.50; tab-bar-auto-width plus display space cpu spin

[Aaron Jensen]

Apologies for top posting, on my phone. I should note that my actual tab function has text as well (the tab name) and then I add a space at the end. The spaces are just visual padding.

Aaron

On Sat, Nov 12 2022 at 1:33 PM, Juri Linkov <juri@linkov.net> wrote:

My tab-bar-tab-name-format-function causes 100% cpu spin as of ca3763af5c. Disabling tab-bar-auto-width fixes it.

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To repro: emacs -Q -l repro.el

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repro.el:

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(defun aj/tab-bar-tab-name-format (tab i)
(propertize
(propertize " " 'display '(space :width (8)))
'face (funcall tab-bar-tab-face-function tab)))

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(setq tab-bar-tab-name-format-function #'aj/tab-bar-tab-name-format)

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(tab-bar-mode)

Thanks for the bug report. Since with
(propertize " " 'display '(space :width (8))) the tab width can't grow more than 8 pixels,
a possible fix would be on every iteration
that adds more spaces to the tab name
to check if the tab width remains the same.