top level (floating) window on macos

[rawnly]

Is your feature request related to a problem? Please describe.
I would love to have my wezterm window on top of other windows.

Describe the solution you'd like
This can be done in Swift via:

window.level = .floating

After a small search on github and cocoa crate repo i figure out a possible solution, and tried it in the hello_world example of cocoa-foundation-rs/cocoa

      // create Window
      let window = NSWindow::alloc(nil)
          .initWithContentRect_styleMask_backing_defer_(
              NSRect::new(NSPoint::new(0., 0.), NSSize::new(200., 200.)),
              NSWindowStyleMask::NSTitledWindowMask,
              NSBackingStoreBuffered,
              NO,
          )
          .autorelease();


      window.setLevel_(1); // this is what we need

      window.cascadeTopLeftFromPoint_(NSPoint::new(20., 20.));
      window.center();

It would be super nice to have this option in the Window menu, something such as "Keep on top" or "Floating Window".

I wanted to open a PR for this but I'm not familiar with the codebase and I'm not sure where this should be added. If you can provide some indications I can try implementing this myself and open a PR :)

Describe alternatives you've considered
not implementing

Additional context

• cocoa-rs#setLevel_ documentation

• Official Apple CGWindowLevelKey documentation

• NSWindow.Level documentation

[rawnly]

Demo

CleanShot.2023-11-12.at.14.13.32.mp4

[rawnly]

After a bit of investigation and some experiments looks like setLevel_ accepts an i64 that is not binded to the NSWindow.level or CGWindowLevelKey value. However 0 is for normal window, 1 is floating.

[github-actions]

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