Re: Emacs's set-frame-size can not work well with gnome-shell?

[Dmitry Gutov]

On 03.04.2020 18:08, martin rudalics wrote:
>  >> OK.  Eli, I would like to install the attached patch for Emacs 27.
>  >
>  > I'm sorry, I'm really at a loss regarding this jumbo changeset.  Why
>  > exactly does it have to be in Emacs 27?  Child frames were introduced
>  > in Emacs 26, not Emacs 27.
>
> Apparently, child frames are in wider use only since last year.

Two years ago, to be more accurate.

Here's a bug report that's almost as old: 
https://github.com/tumashu/company-posframe/issues/2

In any case, they've really started to be used/tested/etc after Emacs 26 
was released.