ComboBox in Wayland (Sway) session

Describe the bug I run Avalonia app with ComboBox in Sway session (from terminal emulator using dotnet run command). If I click on ComboBox several times (trying to select its items) then window of my app is closing with a lot of messages in terminal emulator like: libGL error: failed to create drawable libGL error: failed to create drawable libGL error: failed to create drawable libGL error: failed to create drawable libGL error: failed to create drawable libGL error: failed to create drawable libGL error: failed to create drawable libGL error: failed to create drawable libGL error: failed to create drawable libGL error: failed to create drawable libGL error: failed to create drawable libGL error: failed to create drawable libGL error: failed to create drawable … Then I press ^C 130 user@mypc ~/src/failapp

And sometimes Wayland graphical session is closing with errors as I can see in console terminal:

00:00:28.906 [xwayland/xwm.c:1398] xcb error: op ChangeProperty (no minor), code Window (no extension), sequence 189, value 4194305 (EE) (EE) Backtrace: (EE) 0: Xwayland (0x5626cae00000+0x15d543) [0x5626caf5d543] (EE) 1: Xwayland (0x5626cae00000+0x15d63e) [0x5626caf5d63e] (EE) 2: /usr/lib/libc.so.6 (0x7f437d10d000+0x3d6a0) [0x7f437d14a6a0] (EE) 3: Xwayland (0x5626cae00000+0x8c580) [0x5626cae8c580] (EE) 4: Xwayland (0x5626cae00000+0x9716e) [0x5626cae9716e] (EE) 5: Xwayland (0x5626cae00000+0x9edfb) [0x5626cae9edfb] (EE) 6: Xwayland (0x5626cae00000+0x315a9) [0x5626cae315a9] (EE) 7: /usr/lib/libc.so.6 (__libc_start_main+0xf2) [0x7f437d135152] (EE) 8: Xwayland (0x5626cae00000+0x328be) [0x5626cae328be] (EE) (EE) Segmentation fault at address 0x0 (EE) Fatal server error: (EE) Caught signal 11 (Segmentation fault). Server aborting (EE) (WW) Option "-listen" for file descriptors is deprecated Please use "-listenfd" instead. (WW) Option "-listen" for file descriptors is deprecated Please use "-listenfd" instead. glamor: No eglstream capable devices found The XKEYBOARD keymap compiler (xkbcomp) reports: > Warning Unsupported maximum keycode 569, clipping > X11 cannot support keycodes above 255 Errors from xkbcomp are not fatal to the X server 00:02:13.246 [xwayland/xwm.c:1398] xcb error: op ChangeProperty (no minor), code Window (no extension), sequence 196, value 4194657 Gdk-Message: 01:15:20.795: Error reading events from display: Обрыв канала 139 user@mypc ~ % 00:00:00.028 [commmon/ipc-client.c:67] Unable to connect to /run/user/1000/sway-ipc.1000.559.lock 00:00:00.000 [commmon/ipc-client.c:67] Unable to connect to /run/user/1000/sway-ipc.1000.559.lock

To Reproduce Steps to reproduce the behavior:

1. Install dotnet-sdk from AUR
2. Create avalonia app using dotnet new avalonia.mvvm -n nameoftheapp
3. Slightly change nameoftheapp.csproj and Program.cs to use avalonia 0.10.0-rc1 (by default it uses 0.9.12) and net5.0
4. Add <ComboBox/> tag (even without items) to MainWindow.xaml
5. Start sway using exec sway command
6. Run nameoftheapp app with ComboBox via dotnet run from your terminal emulator
7. Interact with ComboBox click on it several times, selecting it items.

Desktop (please complete the following information):

• OS: Linux (Arch linux, kernel 5.10.3-arch1-1)
• Avalonia version 0.10.0-rc1
• Xwayland version 1.20.99 (12099001)
• Sway version 1.5.1
• Dotnet is from AUR (5.0.101)
• I’ve tried to use Intel GPU and AMD GPU

[kekekeks]

I guess Xwayland somehow gets confused about Avalonia using a separate thread for OpenGL drawing. Try adding

.With(new X11PlatformOptions
{
    UseDeferredRendering = false
})

to your BuildAvaloniaApp and see if it changes anything.

instead of getting any errors my screen freezes and I have to hard reset my PC

Screen freeze also indicates a bug in somewhere in Sway/Xwayland/libwayland

[AlienJust]

to your BuildAvaloniaApp and see if it changes anything.

It did not change anything.

But changing Arch linux pacakge from extra/xorg-xwayland 1.20.0.r800.ge4a9f0bb4-1 to aur/xorg-server-xwayland-dev 1.20.8-1 fixed the problem. Thank You!