bug#51883: 29.0.50; Command to get accidentally deleted frames back

[Juri Linkov]

>> I hear your arguments, but IMO that would be like making "undo" opt-in.
>> I also wouldn't call that a "minor" feature, it's worth an entry in the
>> File menu.  Indeed we don't know what this could cause with exotic usage
>> patterns, so I suggest, given that the release of Emacs 29 is far away in
>> the future, to make it opt-out on the trunk, and if someone protests
>> because it breaks their usage pattern before Emacs 29 is released, to make
>> it opt-in instead.
>
> No, please make it opt-in from the get-go, which will also remove the
> need for some of the code which messes with the initial frame.  If
> many users will request it be on by default, we will then reconsider.

Many users already requested it be on by default.