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Until now, touch events sort of rely on XI_Enter/XI_Leave events accompanying the pointer emulating touch in order to have a stage set on the device, These events won't happen though if it's not a pointer emulating touch which happens on the stage, causing touch events to be ignored. Fix this by ensuring that the input device has a stage on XI_TouchBegin itself, but only if it's not already set, so we don't possibly steal touch events to an already interacting stage. https://bugzilla.gnome.org/show_bug.cgi?id=732234