Fix/Workaround T40102: RMB on vertex & GKey, acts as double-G

source/blender/editors/transform/transform.c

@@ -994,7 +994,11 @@ int transformEvent(TransInfo *t, const wmEvent *event)
 				}
 				else {
 					if (t->obedit && t->obedit->type == OB_MESH) {
-						if ((t->mode == TFM_TRANSLATION) && (t->spacetype == SPACE_VIEW3D)) {
+						if ((t->mode == TFM_TRANSLATION) &&
+						    (t->spacetype == SPACE_VIEW3D) &&
+						    /* prevents accidental select-tweak, gkey. see: T40102 */
+						    (ISMOUSE(t->launch_event) == 0))
+						{
 							resetTransModal(t);
 							resetTransRestrictions(t);
 							restoreTransObjects(t);