Re: Question about üarent-frame changes

[Po Lu <luangruo@yahoo.com>]

Eli Zaretskii <eliz@gnu.org> writes:

>> Date: Thu, 19 Sep 2024 10:10:11 +0200
>> Cc: gerd.moellmann@gmail.com, emacs-devel@gnu.org
>> From: martin rudalics <rudalics@gmx.at>
>> 
>>  > sounds not very useful to me on a TTY, because switching frames on a
>>  > TTY will make the child frame invisible anyway.  And why would I want
>>  > to see a child of frame F1 when I display only frame F2?
>> 
>> Because the calling code may reparent the child frame from F1 to F2
>> whenever the user switches from frame F1 to frame F2.  At least Po Lu
>> said that applications do such reparenting.
>
> Isn't that the same as simply showing the child frame even though its
> parent frame is obscured?
>
> And I'd need to hear more details about what the application wants to
> achieve by such reparenting, to understand the issue.

They simply wish to retain created child frames for as long a period as
possible, because frame creation is expensive, and configuring a child
frame to behave as intended is hard work.  See posframe.el (on ELPA) for
a typical instance, where three years ago I encountered the same dilemma
with the Haiku port.