I assumed that once the xdisp changes were deemed acceptable, we'd suggest a tab bar highlight face. That would be in lisp.
My patch is all in xdisp.c so I don't follow.
> I assumed you knew how to use tab-bar :) I rarely use emojis but this one I
> couldn't help myself.
>
> It also works with mouse-face on any spans of glyphs embedded in the name
> string.
But this doesn't look normal, don't you think so?
tab-bar-mode enabled, then later disabled,
code evaluated, enabled again, and no effect.
Something is wrong here? There are no other settings
that behave that way.
> > (defun my/tab-bar-tab-name-format-function (tab i)
> > (propertize
> > (tab-bar-tab-name-format-default tab i)
> > 'mouse-face '(:inverse-video t))) ; or a named face
> > (setopt tab-bar-tab-name-format-function
> > #'my/tab-bar-tab-name-format-function)
> >
> > And move the mouse over the tab. It should invert. It does for me.
>
> Thanks, now it works. The requirement is that the tab-bar-mode
> should be disabled before evaluating the above code. Otherwise,
> with already enabled tab-bar-mode it has no effect.