bug#64373: 29.0.90; C-x t o while in minibuffer copies the current tab to the next tab

[Juri Linkov]

>>> 1. emacs -Q
>>> 2. C-x t 2 to create a new tab
>>> 3. C-x b *Messages* RET
>>>    Now the first tab should have only *scratch* open,
>>>    and the second tab should have only *Messages* open,
>>>    and we're in the second tab.
>>> 4. M-: (read-from-minibuffer "") RET
>>> 5. While in minibuffer, C-x t o to switch to the first tab
>>> 6. RET to exit minibuffer
>>> 7. The first tab now has *Messages* open.
>>>
>>> This also applies to more complicated window configurations: the whole
>>> window configuration will be copied from the tab that the minibuffer was
>>> first open in, to the tab that was entered with C-x t o.
>>>
>>> This also happens if the minibuffer is exited with C-g.
>>
>> Not a bug, this is the documented behavior.
>> You can customize read-minibuffer-restore-windows to nil
>> if you don't like this.
>
> We should also restore the current tab, then.  Because right now we're
> restoring the window configuration, but not the current tab.
>
> If we did that, then this would behave as expected: We'd restore the
> current tab, then restore the window configuration in that tab.

We should not switch tabs without user's consent.
Even restoring the window configuration is the wrong thing to do.
I don't know why read-minibuffer-restore-windows should be enabled
by default.  Maybe it should be disabled at least when the active
minibuffer switches to another tab.