Re: tab-line-tab-modified: cool feature... not yet there

[Juri Linkov]

> Hi, I've seen a couple of ideas in the internet on how to spped his up. You
> could use the buffer-change hooks and defadvice on undo and would be much
> less than on every keypress, right? I think this could be a good compromise

Fortunately, it was much easier to implement this by adding
just these 3 lines to tab-line-format:

+                          (and (memq 'tab-line-tab-face-modified
+                                     tab-line-tab-face-functions)
+                               (buffer-file-name) (buffer-modified-p))))

So now this is fixed in the emacs-28 branch.