The global mouse position relative to the current [Viewport]. If used in [method Control._gui_input] and if the current [Control] is not under the mouse, moving it will not update this value.
The local mouse position relative to the [Viewport]. If used in [method Control._gui_input], the position is relative to the current [Control] which is under the mouse. If the current [Control] is not under the mouse, moving it will not update this value.