CromeOS Debian VM: Opens with blank dialog, no UI

[jwishnie]

Installs and runs, but shows blank UI.

• Debian 10
• CrOS: 86.0.4240.198

[rkjnsn]

I'm seeing the same issue with the flatpak on CrOS Version 87.0.4280.142 (Official Build) (64-bit).

The VSCode flatpak (which I believe is also Electron based) renders properly, as does Signal Desktop when installed from the Debian repository instead of using flatpak.

If I move the cursor slowly around the blank window in the flatpak, there are a couple of places where it turns to a text I-beam cursor, so it seems like the window is alive, it just never paints for some reason.

I don't see any clues in the console output as far as what might be going wrong, unfortunately.

[tarpin]

The same problem is on Fedora Silverblue.
It seems to be related to this issue: signalapp/Signal-Desktop#4040
Setting the environment variable QT_X11_NO_MITSHM=1 does not work.

[TLATER]

I have a similar problem (no window appears though, presumably because my WM doesn't render anything), it seems to work when given the --no-sandbox flag though - any chance one of you could check that's the problem? Should be easy to fix if so.

[jwishnie]

After updating to Flatpak 1.10.1 via buster-backports, and reinstalling the Signal Flatpak, it is running correctly, even without --no-sandbox