weston_test.move_pointer() sends wl_pointer.motion() event during DnD session

Chromium uses weston_test for its automated Wayland tests. During my work on these tests, I noticed that a weston_test.move_pointer() request during an active drag and drop session leads to a wl_pointer.motion event, and not a wl_data_device.motion event.

If I understand correctly, the weston_test interface is not really meant to be used by something other than weston's own tests. But it would be great if this could be fixed nonetheless, as Chromium's Wayland testing would not be possible without weston_test.