Proper scaling of cursors

[Maxim Kartashev]

I'd like to pick your brains on a Wayland problem that does not look
solvable to me.

In Wayland, where (in general) there are no server-side decorations, the
application is responsible for taking care of its own frame, which includes
changing the mouse cursor when it is above or near the border to indicate
that the window can be resized.

Now consider a set-up with two monitors, one with 100% scale and the other
with 200% scale. Suppose a window is stretched between two of them. The
window is aware of all the monitors it is displayed on, but is not aware
which part is showing where. How is the application supposed to determine
what would be the right scale for the mouse cursor's surface buffer?

If the highest scale is chosen, the cursor will look larger than necessary
on the 100% monitor; this is what we've currently implemented and it
differs from how the "native" Wayland applications behave.

Appreciate your input as always,

Maxim.
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