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I always used xeyes to test X connections in the past.

I wonder if we'll see a wleyes for Wayland, to test Wayland only and not the x11 comparability layer.

As a totally uninformed guess -- no?

Part of wayland's security design decisions is that one program cannot receive events from another program.

An app like xeyes would need cooperation from the compositor otherwise.

It could use a large window and get input from that entire area, right? Not quite the same thing, of course.

Wouldn't that only work when it has focus?

I use xeyes on wayland to determine whether a given app is using Xwayland or not.