Juri Linkov <juri@linkov.net> writes:

> Thanks, it would be nice to support displaying tabs in alternating
> colors.  But there are endless possibilities for look and feel of
> tabs, so instead of hard-coding only one of them for alternating
> colors, I suggest to add a customizable function with a name like
> 'tab-line-tab-face' that with a tab provided as its arg (and a list of
> tabs to be able to find the ordinal number of the given tab) would
> return its face to use.

Yes, that seems like a good idea.  Something like this?  I also added
another face for non-file-backed buffers, which helps distinguish them.

Thanks.