Returns true if the given input event and this input event can be added together (only for events of type InputEventMouseMotion).
The given input event's position, global position and speed will be copied. The resulting relative is a sum of both events. Both events' modifiers have to be identical.
Returns true if the given input event and this input event can be added together (only for events of type InputEventMouseMotion). The given input event's position, global position and speed will be copied. The resulting relative is a sum of both events. Both events' modifiers have to be identical.