[Blocked] Linux: Use Wayland by default; fallback to X11

[dreamsyntax]

BLOCKED/PENDING:

• Waiting for KDE Window Decorator support (expected in Avalonia UI 12.2.0+)
• Fullscreen breaks layout until context changes

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Simple/light Wayland support for Linux. There's a few ways to handle this, but I grabbed what's been working for ShadowONE.

Until Avalonia 12.2.0 (or later) comes out, window icons will be missing:

Note the top left icon will be a "W" when running with Wayland.

Currently, Wayland renders through EGL (with an optional dmabuf path). It supports all core functionalities you would expect: mouse, touch, keyboard, clipboard, drag-and-drop... However, a few KDE-specific niceties (global app menu, window icons, blur-behind) are planned as follow-ups.
https://avaloniaui.net/blog/release-12-1

If the Window icon is a dealbreaker, I would suggest to wait until the next Avalonia 12 update.

I will note that scaling behavior seems the same regardless of X11/Wayland - so there's not much of an advantage to have this in now other than to be ahead of the curve.

[thesupersonic16]

Does this fix any other issues like scaling?

Also can you check if wayland works on flatpak? I believe permissions needed to be changed to allow it.

[dreamsyntax]

I'll double check the flatpak + permissions as I don't think I tried CI build.

Does this fix any other issues like scaling?

#124 (comment)
Nope, noted that above. I don't see any change. Probably implemented intentionally so scaling is uniform

[dreamsyntax]

Yep, you're right. Flatpak breaks, marking draft until I resolve.

[dreamsyntax]

Flatpak working properly now. Tested codes and file replacement mods worked just to be sure as well.
If you want to test:
https://github.com/dreamsyntax/HedgeModManager/releases/tag/8.0.0-wayland-flatpak

[dreamsyntax]

I'll test the flatpak on a Linux Mint VM (Cinnamon is still X11 in latest stable) just to make sure the fallback is working properly for X11.

[dreamsyntax]

Verified works fine with X11 after the flatpak change.

[thesupersonic16]

Does full screen work on wayland? Other than that I think we should wait until the window icon is fixed then merge.

[dreamsyntax]

Marking as draft for now until next Avalonia release (I'm interested for my other apps, so I'll come reopen this when I see its ready).

As for full screen, it breaks after toggling until you change pages:

I'll look into that once the new Avalonia.Wayland posts.