Re: Undo mode

[Gregory Heytings]

> I think it's better to add a specific workaround in 
> `undelete-frame--handle-delete-frame` such as:
>
>    (unless (eq frame frame-initial-frame) ...)
>
> And if that specific one doesn't work, we'll come up with a different 
> test.

That problem was already identified and solved (with a boolean state 
variable) in bug#51883, before the current solution (using a minor mode 
that users can turn on in their init file) was adopted.  With a minor mode 
this test becomes unnecessary.