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

[Al Haji-Ali <abdo.haji.ali@gmail.com>]

On 15/06/2024, martin rudalics wrote:
> I'd still prefer a tab-bar specific option (like 'tab-bar-save-frame-p'
> as mentioned earlier) for two reasons.
>
This is probably the right approach to minimize unattended consequences and it would definitely address the issue (which is, to reiterate, is that fundamentally, tabs behave like windows in many situations, but not when deleting buffers with dedicated windows -- having two windows prevents deleting a frame, but not having two tabs).

I imagine Juri wanted to avoid having tab-specific code in `window.el` with the previous patch, hence the more generic hooks. The current patch of Juri should probably be protected with `featurep` or `fboundp` for tab-specific symbols.

Also if the proposed change to `window-deletable-p` is adopted, then a grep on `window-deletable-p` also reveals that, for consistency, `delete-windows-on` and even `calendar-exit` in `calendar.el` should be modified similarly to `window--delete`.

Best regards,
-- Al