fix(linux): Port to gtk4-rs

[conradhale]

Closes #1051

You can find more info on most of the changes in the GTK docs

Summary of changes

Most of the X11-specific features have been removed from GTK4. This includes getting/setting window position, setting cursor position, getting global coordinates of pointer, setting window level (always-on-top), making window visible on all workspaces, and setting the skip taskbar hint.

Some of these methods can still be found in gdk-x11, however, X11 support is set to be completely removed from GTK5, and has been deprecated in GTK4.18. I personally do not think it is worth the effort to add the extra code to continue supporting these features though. Most developers using TAO really shouldn't depend on X11-only features since the number of people using X11 is becoming increasingly small. Differences in behavior on X11 and Wayland is also in many cases a recipe for bugs.

I've also added some features that were previously missing from the Wayland backend, like getting the cursor position (relative to the surface), and setting the urgency hint for the window (uses xdg-activation like winit).

gtk-rs-core also removed MainContext::channel, so I've followed the reccomendation of using context.spawn_local() with async-channel.

Also, due to the GtkWidget::configure_event being removed, I had to subclass GtkWindow to allow connecting to changes in the Window's size allocation, since the default-width and default-height property change notification are fired too late to be used for making layout changes.

Finally, I switched to using gdk-x11 and gdk-wayland instead of gdk-x11-sys and gdk-wayland-sys. It's now possible to get the window xid and wl_surface id without unsafe code, making the raw_window_handle functions implementations closer to winit's.

Todo

• Support creating window with Libadwaita (Enabled via cargo feature probably).
• Update .changes
• Test on X11

[github-actions]

Package Changes Through f250ce8

There are 1 changes which include tao with minor

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
tao	0.32.8	0.33.0

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