Re: 31.0.50; tab-bar-formal-global erased global-modeline-string's mouse hover/click action menu

[Eli Zaretskii]

> From: Eval EXEC <execvy@gmail.com>
> Date: Wed, 04 Sep 2024 22:12:21 +0800
> 
> I'm using tab-bar-mode, and I've included `tab-bar-format-global` in 
> `tab-bar-format`. This displays `global-mode-string` on the tab-bar.
> 
> ```elisp
> (setq-default tab-bar-format
>               tab-bar-format-menu-bar
>               tab-bar-format-history
>               tab-bar-format-tabs
>               tab-bar-separator
>               tab-bar-format-add-tab
>               tab-bar-separator
>               tab-bar-format-align-right
>               tab-bar-format-global)
> ```
> 
> However, in `global-mode-string`, I have `mu4e`. The tab-bar seems to remove 
> the hover and mouse click actions from `global-mode-string`.
> 
> It appears that the issue is related to the use of "ignore":
> ```elisp
> (defun tab-bar-format-global ()
>   "Produce display of `global-mode-string' in the tab bar.
> When `tab-bar-format-global' is added to `tab-bar-format'
> \(possibly appended after `tab-bar-format-align-right'),
> then modes that display information on the mode line
> using `global-mode-string' will display the same text
> on the tab bar instead."
>   (mapcar (lambda (string)
>             `(global menu-item ,(format-mode-line string) ignore))
>           global-mode-string))
> ```
> 
> If I remove `tab-bar-format-global` from `tab-bar-format`, the 
> `global-mode-string` displays on the mode-line, and the `mu4e` indicator in 
> `global-mode-string` works with mouse hover and click. I believe that if 
> `global-mode-string` is displayed on the tab-bar, its items should also 
> support mouse hover and click.
> 
> What do you think? How can I quickly hack the tab-bar to enable mouse hover 
> and click for `global-mode-string`?

Thanks, but this should have been sent to bug-gnu-emacs@gnu.org, where
it would be picked up by our bug tracker.