bug#65554: 30.0.50; help-echo string for truncated tab-bar names is not viewable

[Visuwesh]

[திங்கள் ஆகஸ்ட் 28, 2023] Juri Linkov wrote:

>>> however, tab-bar--format-tab which is used by
>>> tab-bar-format-tabs overrides this help-echo string with "Current tab"
>>> and "Click to visit tab".  If I remove :help plist items from
>>> tab-bar--format-tab, then I don't get the help-echo string that was set
>>> by tab-bar-tab-name-truncated but what the tab looks like in Emacs.
>>
>> When truncation will be in tab-bar-tab-name-format-function
>> then the useless help-echo strings in tab-bar--format-tab
>> could be replaced with help strings that display the full names.
>
> Now the help strings are displaying the full tab names.

I customised tab-bar-tab-name-function to -truncated but it still shows
the truncated name in the tooltip.  If I change -format-function to
-truncated, then I don't see the truncation in the tab name...
I am changing the functions as per the choices in the Custom interface.

> Next I could rename tab-bar-tab-name-format-function to
> tab-bar-tab-name-format-functions with the default value
> composed from the code fragments of tab-bar-tab-name-format-default:
>
>   '(tab-bar-tab-name-format-hints
>     tab-bar-tab-name-format-close-button
>     tab-bar-tab-name-format-face
>    )
>
> Then you will be able to customize it to:
>
>   '(tab-bar-tab-name-format-truncate
>     tab-bar-tab-name-format-hints
>     tab-bar-tab-name-format-close-button
>     tab-bar-tab-name-format-face
>    )
>
> That first will truncate the tab name, then add numeric hints to the
> truncated name, then add the close button, then put faces on the final string
> that will be displayed on the tab bar.

That would be much more convenient, and make the customisation around
the tab name a lot less confusing.