Bug#927718: gnome-shell: performance regression for graphically intensive full-screen apps (games) since 3.30.1

[Simon McVittie]

Package: gnome-shell
Version: 3.30.2-7
Severity: important
Tags: patch upstream fixed-upstream
Forwarded: https://gitlab.gnome.org/GNOME/gnome-shell/issues/799

https://gitlab.gnome.org/GNOME/gnome-shell/issues/799
> I've experienced a rather severe drop in performance after upgrading
> to gnome-shell 3.30.2-1 in Fedora 29.
...
> I think 62c2dbbc broke unredirection of fullscreen windows after a
> notification has been shown.

I believe this affects buster. Its practical effect is:

* Steps to reproduce: Do something that will provoke a notification later.
  Run a graphically-intensive fullscreen 3D game.
* Expected result: The game's performance drops while the notification is
  showing, but recovers afterwards.
* Actual result: The game's performance drops and does not recover.

I'm opening a bug for this because the change has been backported to the
upstream gnome-3-30 branch, and I think it's something we should consider
applying to buster.

    smcv
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