Performance improvements Ph1

src/Mod/TechDraw/App/DrawViewDimension.cpp

@@ -127,30 +127,11 @@ DrawViewDimension::~DrawViewDimension()
 void DrawViewDimension::onChanged(const App::Property* prop)
 {
     if (!isRestoring()) {
-        if (prop == &References2D  ||
-            prop == &Font        ||
-            prop == &Fontsize    ||
-            prop == &FormatSpec  ||
-            //prop == &CentreLines ||
-            prop == &LineWidth) {
-            try {
-                App::DocumentObjectExecReturn *ret = recompute();
-                delete ret;
-            }
-            catch (...) {
-            }
-        }
         if (prop == &MeasureType) {
             if (MeasureType.isValue("True") && !measurement->has3DReferences()) {
                 Base::Console().Warning("Dimension %s missing Reference to 3D model. Must be Projected.\n", getNameInDocument());
                 MeasureType.setValue("Projected");
             }
-            try {
-                App::DocumentObjectExecReturn *ret = recompute();
-                delete ret;
-            }
-            catch (...) {
-            }
         }
         if (prop == &References3D) {                                       //have to rebuild the Measurement object
             clear3DMeasurements();
@@ -176,14 +157,15 @@ void DrawViewDimension::onDocumentRestored()
 short DrawViewDimension::mustExecute() const
 {
     bool result = 0;
-    if (References2D.isTouched() ||
-        Type.isTouched() ||
-        MeasureType.isTouched()) {
-        result =  1;
-    } else {
-        result = 0;
+    if (!isRestoring()) {
+        result =  (References2D.isTouched() ||
+                  Type.isTouched() ||
+                  MeasureType.isTouched());
     }
-    return result;
+    if (result) {
+        return result;
+    }
+    return DrawView::mustExecute();
 }
 
 App::DocumentObjectExecReturn *DrawViewDimension::execute(void)