Public bug reported:

I like some things like terminal to be fullscreen (F11). I've noticed
that whenever I look at what apps are running by tapping the Super key
and then go to any app that is in fullscreen mode (by either hit the
Super key again to give focus back to the app OR click the app I'd like
to focus on), there is a flash of the background. This is 100%
reproducible for me.


ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: gnome-shell 3.34.1+git20191024-1ubuntu1~19.10.1
ProcVersionSignature: Ubuntu 5.3.0-24.26-generic 5.3.10
Uname: Linux 5.3.0-24-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset 
nvidia
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Dec 12 16:10:26 2019
DisplayManager: gdm3
InstallationDate: Installed on 2019-09-11 (92 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
ProcEnviron:
 TERM=screen
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: mutter-common 3.34.1+git20191107-1ubuntu1~19.10.1
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to eoan on 2019-09-24 (79 days ago)

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug eoan

** Description changed:

  I like some things like terminal to be fullscreen (F11). I've noticed
  that whenever I look at what apps are running by tapping the Super key
  and then go to any app that is in fullscreen mode (by either hit the
  Super key again to give focus back to the app OR click the app I'd like
  to focus on), there is a flash of the background. This is 100%
  reproducible for me.
  
- Whenever I have a fullscreen app focused on, and then hit the super key,
- I see this JS ERROR in the journalctl:
- 
- Dec 12 16:15:14 bmo gnome-shell[3482]: JS ERROR: TypeError: 
this._workspacesViews[i] is undefined
-                                        
_updateWorkspacesFullGeometry@resource:///org/gnome/shell/ui/workspacesView.js:774:13
-                                        
setWorkspacesFullGeometry@resource:///org/gnome/shell/ui/workspacesView.js:764:9
-                                        
setWorkspacesFullGeometry@resource:///org/gnome/shell/ui/viewSelector.js:293:9
-                                        
_updateWorkspacesGeometry@resource:///org/gnome/shell/ui/overviewControls.js:471:9
-                                        
vfunc_allocate@resource:///org/gnome/shell/ui/overviewControls.js:415:9
-                                        
_computeWindowCenter@resource:///org/gnome/shell/ui/workspace.js:309:19
-                                        
_init@resource:///org/gnome/shell/ui/workspace.js:160:9
-                                        
_addWindowClone@resource:///org/gnome/shell/ui/workspace.js:1845:21
-                                        
Workspace<@resource:///org/gnome/shell/ui/workspace.js:1166:17
-                                        
_updateWorkspaces@resource:///org/gnome/shell/ui/workspacesView.js:265:29
-                                        
WorkspacesView<@resource:///org/gnome/shell/ui/workspacesView.js:100:9
-                                        
_updateWorkspacesViews@resource:///org/gnome/shell/ui/workspacesView.js:678:24
-                                        
show@resource:///org/gnome/shell/ui/workspacesView.js:608:9
-                                        
show@resource:///org/gnome/shell/ui/viewSelector.js:268:9
-                                        
_animateVisible@resource:///org/gnome/shell/ui/overview.js:532:9
-                                        
show@resource:///org/gnome/shell/ui/overview.js:518:9
-                                        
toggle@resource:///org/gnome/shell/ui/overview.js:639:13
-                                        
_initializeUI/<@resource:///org/gnome/shell/ui/main.js:211:13
- Dec 12 16:15:14 bmo gnome-shell[3482]: NOTE: Not using GLX TFP!
  
  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: gnome-shell 3.34.1+git20191024-1ubuntu1~19.10.1
  ProcVersionSignature: Ubuntu 5.3.0-24.26-generic 5.3.10
  Uname: Linux 5.3.0-24-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset 
nvidia
  ApportVersion: 2.20.11-0ubuntu8.2
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Dec 12 16:10:26 2019
  DisplayManager: gdm3
  InstallationDate: Installed on 2019-09-11 (92 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  ProcEnviron:
-  TERM=screen
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  TERM=screen
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  RelatedPackageVersions: mutter-common 3.34.1+git20191107-1ubuntu1~19.10.1
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to eoan on 2019-09-24 (79 days ago)

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https://bugs.launchpad.net/bugs/1856251

Title:
  Going from apps overview screen to fullscreen'd app causes flash

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