Regression in [0]. When zoomed in, we can be within the face of an island but too far
from an edge, in this case uv_find_nearest_face_multi_ex is used instead
of uv_find_nearest_edge_multi with the consequence that hit.l cannot be
used in uvedit_uv_select_test (it is NULL).

Instead, use uvedit_face_select_test instead in this case.

[0]: d356edf420ba13b3a544dcc598a0e31a36e1d86c

Would be good for 3.2 I guess.