Gnome stops responding if gedit is not responding

[Jaromir Obr]

It seems to be a regression in Ubuntu 19.10.
It works well with Ubuntu 19.04.
I compared the behavior in both distros on the same HW.

Steps to reproduce:
* Download https://github.com/vrana/adminer/releases/download/v4.7.4/adminer-4.7.4.php (485 kB)
* Try to open the file in gedit
* Gedit isn't able to open it, see the performance bug #1850046

Expected result:
* You are still able to switch to another application using Alt + TAB or run new application using "Super + command"

Actual result:
* It's almost impossible, Gnome doesn't response on those keyboard shortcuts. It worked only once when I tested it.
* I noticed that the dialog "Text Editor not responding" appears in Ubuntu 19.10 after longer time than in 19.04. The buttons in it are not responding in 19.10 (in 19.04 they are)

Used HW and SW:
* HW: HP Envy 13 Skylake
* SW: Ubuntu 19.10, gnome-shell 3.34.1

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: gnome-shell 3.34.1-1ubuntu1
ProcVersionSignature: Ubuntu 5.3.0-19.20-generic 5.3.1
Uname: Linux 5.3.0-19-generic x86_64
ApportVersion: 2.20.11-0ubuntu8
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sun Oct 27 20:20:51 2019
DisplayManager: gdm3
InstallationDate: Installed on 2015-12-29 (1398 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
RelatedPackageVersions: mutter-common 3.34.1-1ubuntu1
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Jaromir Obr (jaromir-obr)]

I don't agree it is a duplicate of the bug #505765.
Bug #505765 is an old bug in gedit happening in any distro whereas this bug #1850073 is a regression in recently released Ubuntu 19.10 (Gnome) and should be prioritized another way.

[Daniel van Vugt (vanvugt)]

I have added a gnome-shell task to bug 1850046 to cover this now.