UI: enable the depend-on-cursor flag for some operators

- Bend (Transform).
- Extrude to Cursor.
- Lasso Select (related operators such as node-cut links, mask.. etc).
- Rip Mesh / UV's.
- Vertex/Edge Slide.

source/blender/editors/mesh/editmesh_tools.c

@@ -4323,7 +4323,7 @@ void MESH_OT_knife_cut(wmOperatorType *ot)
   ot->poll = EDBM_view3d_poll;
 
   /* flags */
-  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
+  ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO | OPTYPE_DEPENDS_ON_CURSOR;
 
   /* properties */
   PropertyRNA *prop;