>> Indeed, the patch seems simple enough. I am unsure about reusing the
>> option. If I understand correctly `auto-resize-tab-bars' is about
>> resizing the height according to the face? I think we want to control
>> both things separately, truncation and resizing of the height. Therefore
>> I would rather add another option `truncate-tab-bars'. What do you
>> think?
>
> The name `auto-resize-tab-bars' was created for compatibility
> with the `auto-resize-tool-bars'.  But for new variables better
> to use the prefix `tab-bar-'.  Then the name would be `tab-bar-truncate'.

Ok, I will push the patch with the new name: