This greatly improves the mesh edit tabs after a few weeks of feedback, making the tabs more practical with less need to switch tabs often. Based on discussion on IRC and T37568.
Reviewers: campbellbarton
CC: campbellbarton, brecht
Reviewers: campbellbarton
Reviewed By: campbellbarton
CC: campbellbarton, brecht
Differential Revision: https://developer.blender.org/D269