Gui: forbid to delete OriginFeatures

src/Gui/ViewProviderOriginFeature.cpp

@@ -38,6 +38,7 @@
 #endif
 
 #include <App/Document.h>
+#include <App/OriginFeature.h>
 
 #include "SoFCSelection.h"
 #include "Window.h"
@@ -176,3 +177,14 @@ void ViewProviderOriginFeature::setDisplayMode (const char* ModeName)
         setDisplayMaskMode("Base");
     ViewProviderGeometryObject::setDisplayMode(ModeName);
 }
+
+bool ViewProviderOriginFeature::onDelete(const std::vector<std::string> &) {
+    App::OriginFeature *feat = static_cast <App::OriginFeature *> ( getObject() );
+    // Forbid deletion if there is an origin thes feature belongs to
+
+    if ( feat->getOrigin () ) {
+        return false;
+    } else {
+        return true;
+    }
+}