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

[Juri Linkov]

>> > As an aside, auto-width doesn't work very well when using a
>> > variable-pitch font for your tab bar. Specifically, for me it doesn't
>> > take up the full width when I have enough tabs that would fill that
>> > width.
>>
>> Sorry, I don't understand the problem.  It doesn't take up the full width
>> of the tab bar?  Does it fill the whole tab bar when you customize
>> tab-bar-auto-width-max to nil?
>
> No, it does not. It's not computing the overall width of the window
> correctly or something like that: https://share.cleanshot.com/otuZj4

Could you show the minimal tab function that reproduces the problem.
Is it more like this?

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

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