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I want to use this as a replacement for
Meta.Window.shown
since it has proven to be wrong in e.g. #2088.I don't even think
Meta.Window.shown
was intended to be used for determining whether the window actor was shown. But in short, when the new window is created the Wayland windows are 'hidden' by default but X11 are not. because of this theMeta.Window.shown
sometimes is not called.The code here only touches WindowClone to show that it works, I'll propose PR to replace the use of 'shown' later.