gnome-screenshot freezes UI in Xorg sessions

[nluciano233]

Bug Description

On ubuntu we have a handy shortcut to take screenshots then select the are to grab. By default the shortcut is assigned to shift+print (Prt Scrn key on the keyboard). If I go into Google Chrome, open the options panel (the 3 little vertical dots), then go into "Help", and hover my cursor over the side panel that opens, then use the shift+print shortcut to take a screenshot, my system does something similar to a freeze. I can use the keyboard, but I cant click UI elements with the mouse, for example I can't click the top bar, the sidebar, so I can't do anything, I'm stuck. My only option is to open the console and to log out manually with a command, then everything is back to normal.

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Steps to reproduce

Open Google Chrome. Click on the settings tab (the 3 vertical dots). Click on "Help". Hover the cursor above "Help Center". Press shift+print.

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1) Ubuntu 20.04.1 LTS
   Gnome Version 3.36.8

2) gnome-screenshot:
   Installed: 3.36.0-1ubuntu1
   Candidate: 3.36.0-1ubuntu1
   Version table:
   *** 3.36.0-1ubuntu1 500
        500 http://it.archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status

3) I expect to not froze my UI when I try to take a screenshot with shift+print.

4) It freezes my UI.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-screenshot 3.36.0-1ubuntu1
ProcVersionSignature: Ubuntu 5.8.0-40.45~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-40-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon Jan 25 20:44:25 2021
InstallationDate: Installed on 2021-01-24 (1 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: gnome-screenshot
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

Thanks for the bug report. It looks like we should use bug 1910235 for this.