Blender Git Loki

Fix T77068: UV Proportional Edit "Connected Only" option affects UV
clipping (even if the proportional edit itself is disabled)

Checking T_PROP_EDIT_ALL returns true for _any_ of the options, so just
check for T_PROP_EDIT.

Note: this might expand to other similar checks (e.g. header text)

Maniphest Tasks: T77068

Differential Revision: https://developer.blender.org/D7927