bug#59438: 29.0.50; [PATCH] Make defvar's into defcustom's in tab-line

[Stefan Kangas]

Gabriel <gabriel376@hotmail.com> writes:

> Please find attached a patch that proposes the following minor changes
> to tab-line.  I can refactor the patch if we decide that some change are
> not worth or if it's better to split it into smaller patches.
>
> 1) Turn the following defvar's into defcustom's:
>
> - `tab-line-tabs-buffer-group-function'
> - `tab-line-tabs-buffer-group-sort-function'
> - `tab-line-tabs-buffer-groups-sort-function'
>
> 2) Add conditional around function call of
> `tab-line-tabs-buffer-groups-sort-function', in
> `tab-line-tabs-buffer-groups'.  This guards against nil values, similar
> to how `tab-line-tabs-buffer-group-sort-function is handled, making the
> behavior more consistent across these two (similar) variables.
>
> Should we announce these "new" defcustom's in NEWS?

Juri, thoughts?