Revert "Revert "Allow navigating while transforming""

This reverts commit 5e6fdaa07f.

source/blender/editors/transform/transform.c

@@ -108,9 +108,6 @@ void setTransformViewMatrices(TransInfo *t)
     unit_m4(t->persinv);
     t->persp = RV3D_ORTHO;
   }
-
-  calculateCenter2D(t);
-  calculateCenterLocal(t, t->center_global);
 }
 
 void setTransformViewAspect(TransInfo *t, float r_aspect[3])
@@ -902,8 +899,6 @@ int transformEvent(TransInfo *t, const wmEvent *event)
       t->con.mode |= CON_SELECT;
     }
 
-    copy_v2_v2_int(t->mval, event->mval);
-
     /* Use this for soft redraw. Might cause flicker in object mode */
     // t->redraw |= TREDRAW_SOFT;
     t->redraw |= TREDRAW_HARD;