Since the new window is in the new process, can we get the new window' Window object?
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On Window, the new window's routing id is equal to main window's.
On Linux, the new window's routing id is different. But calling new window's method from main window has no action.
I ran into this one myself trying to ensure that the currently active window gets certain events. There doesn't seem to be a way to get a reference to created windows in this case.