bug#71386: 29.1; Frame is auto-deleted even when it has multiple tabs

[martin rudalics]

> This patch just copies the logic of frame handling to tab handling.
> There is no customization for frame handling,

There is: 'auto-hide-function'.

> so there is
> no customization for tab handling.

But we want to customize the new behavior whether to retain a frame
because it has outstanding tabs or not.

> In window-deletable-p there is hard-coded 'frame-root-window-p'
> that checks if the frame has only 1 window.  So the patch
> does the same by checking if there is only 1 tab on the frame.
>
> Also in window--delete the call of 'tab-bar-close-tab'
> corresponds to the call 'delete-frame'.

And if a user wants to auto-hide the frame?

martin