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

[Al Haji-Ali]

On 17/06/2024, martin rudalics wrote:
> This means that we should do the entire fix within 'window-deletable-p',
> right?  That's not an internal function, so we can, in all conscience,
> supply an abnormal hook as in the roughly tested patch attached.

It would be great if the fix is done entirely in `window-deletable-p`, but is 
the idea functions in `window-deletable-functions` could have side-effects even 
though they are called from a predicate?

For tabs, I believe an ideal fix would close the tab in lieu of deleting the 
frame when the buffer of a dedicated window is killed (similar to what Juri 
does in per patches).

-- Al