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Is there any documentation around Compose Desktop's handling of multiple physical screens?

Context: I am aligning windows relative to each other, but it's unclear how this will work in Compose, because `WindowState` only contains coordinates with no "display" that they are relative to.

Not that I know off. if i were you I would look at how this can be done using Swing. Use those APIs and then 'translate' that to Compose if needed

You can get the underlying AWT `window` and use that.

`Window.graphicsConfiguration.device` has the right information, it's just not observable since it's not part of Compose :disappointed:

It also seems like even if you have the `GraphicsDevice` from that, Swing offers no way to move a window between screens, other than `Window.setLocationRelativeTo(Component)`, which isn't really ideal.

It'd be great if `WindowState` (or `WindowPosition`) had a `display` field on it

You have the same tools as we do in that regard.

Wayland doesn't allow clients to place their own windows, so such an approach would be limited on some platforms at least

Oh very interesting. Even undecorated windows? How do things like menus/popovers that extend outside the window bounds work in that case?

By specifying the parent/owner window, I imagine. 

Context: I've built fairly robust support for these features for compose on Windows -- essentially NSPopover/Flyout that aren't constrained to the window itself

Ah, definitely looks like I'll need to investigate Wayland at some point. Currently using DialogWindow as the base, which I believe does set the owner properly.

And as a sidenote, life would be way easier if there were more window lifecycle hooks available when instantiating windows.

A good example is that ComposeWindow is implicitly final, but Swing requires subclassing and method overrides to customise certain advanced behaviours (e.g. changing paint behaviour)

A system for drawing/managing windows used by some Linux distributions.