+ support loading projects with old pad features, fix critical bug where the unit gets replaced

src/Mod/Fem/App/FemResultObject.cpp

@@ -38,7 +38,7 @@ PROPERTY_SOURCE(Fem::FemResultObject, App::DocumentObject)
 FemResultObject::FemResultObject()
 {
     ADD_PROPERTY_TYPE(DataType,(""), "General",Prop_None,"Type identifier of the result data");
-    ADD_PROPERTY_TYPE(Unit,(Base::Quantity()), "General",Prop_None,"Unit of the data");
+    ADD_PROPERTY_TYPE(Unit,(0), "General",Prop_None,"Unit of the data");
     ADD_PROPERTY_TYPE(ElementNumbers,(0), "Data",Prop_None,"Numbers of the result elements");
     ADD_PROPERTY_TYPE(Mesh,(0), "General",Prop_None,"Link to the corosbonding mesh");
 }

src/Mod/PartDesign/App/FeaturePad.cpp

@@ -42,6 +42,8 @@
 
 #include <Base/Exception.h>
 #include <Base/Placement.h>
+#include <Base/Console.h>
+#include <Base/Reader.h>
 #include <App/Document.h>
 
 #include "FeaturePad.h"
@@ -75,6 +77,42 @@ short Pad::mustExecute() const
     return Additive::mustExecute();
 }
 
+void Pad::Restore(Base::XMLReader &reader)
+{
+    reader.readElement("Properties");
+    int Cnt = reader.getAttributeAsInteger("Count");
+
+    for (int i=0 ;i<Cnt ;i++) {
+        reader.readElement("Property");
+        const char* PropName = reader.getAttribute("name");
+        const char* TypeName = reader.getAttribute("type");
+        App::Property* prop = getPropertyByName(PropName);
+
+        try {
+            if (prop && strcmp(prop->getTypeId().getName(), TypeName) == 0) {
+                prop->Restore(reader);
+            }
+            else if (prop && strcmp(TypeName,"App::PropertyLength") == 0 &&
+                     strcmp(prop->getTypeId().getName(), "App::PropertyQuantity") == 0) {
+                App::PropertyLength p;
+                p.Restore(reader);
+                static_cast<App::PropertyQuantity*>(prop)->setValue(p.getValue());
+            }
+        }
+        catch (const Base::XMLParseException&) {
+            throw; // re-throw
+        }
+        catch (const Base::Exception &e) {
+            Base::Console().Error("%s\n", e.what());
+        }
+        catch (const std::exception &e) {
+            Base::Console().Error("%s\n", e.what());
+        }
+        reader.readEndElement("Property");
+    }
+    reader.readEndElement("Properties");
+}
+
 App::DocumentObjectExecReturn *Pad::execute(void)
 {
     // Validate parameters

src/Mod/PartDesign/App/FeaturePad.h

@@ -66,6 +66,10 @@ public:
         return "PartDesignGui::ViewProviderPad";
     }
     //@}
+
+protected:
+    void Restore(Base::XMLReader &reader);
+
 private:
     static const char* TypeEnums[];
     //static const char* SideEnums[];