bug#49247: 28.0.50; [Feature Request] Make tab-bar-lines dragable

[martin rudalics]

> But there is a more serious problem: the implementation of
> 'drag-with-tab-line' now closes the tab even after just
> clicking on it to select (not on the close button).
> I can reproduce this only when one of tabs on the tab-line
> contains an *info* buffer (maybe because it has the header-line?)
>
> The problem doesn't exist after evaluating:
>    (global-unset-key [tab-line down-mouse-1])
> I haven't debugged it yet.

I think the culprit is this binding

    (define-key map [tab-line mouse-2] 'tab-line-close-tab)

in `tab-line-tab-map' likely together with some queer mouse-1/mouse-2
mapping.  I'd suggest to don't do that, if possible.  Otherwise, we have
to dig further.

martin