Unlike 3Dview snapping, UV snapping is always done to the UV closest to
the mouse cursor, no matter the distance.
From the user's point of view, this appears to be an inconsistency (See
{T93538}).
Therefore, set a minimum distance for snapping and, as in 3D View and
highlight the snap with a drawing of a circle.
Release Note: https://wiki.blender.org/wiki/Reference/Release_Notes/3.3/Modeling
Reviewed By: #uv_editing, campbellbarton
Maniphest Tasks: T93538
Differential Revision: https://developer.blender.org/D13873
d2271cf939