Only change project snapping settings if it was changed in the dialog

git-svn-id: http://svn.osgeo.org/qgis/trunk@8189 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: mhugent

src/app/qgsprojectproperties.cpp

@@ -329,10 +329,14 @@ void QgsProjectProperties::apply()
 	  snapToList << "to_vertex_and_segment";
 	}
     }
-  QgsProject::instance()->writeEntry("Digitizing", "/LayerSnappingList", layerIdList);
-  QgsProject::instance()->writeEntry("Digitizing", "/LayerSnapToList", snapToList);
-  QgsProject::instance()->writeEntry("Digitizing", "/LayerSnappingToleranceList", toleranceList);
-  QgsProject::instance()->writeEntry("Digitizing", "/LayerSnappingEnabledList", enabledList);
+
+  if(mSnappingLayerSettings.size() > 0)
+    {
+      QgsProject::instance()->writeEntry("Digitizing", "/LayerSnappingList", layerIdList);
+      QgsProject::instance()->writeEntry("Digitizing", "/LayerSnapToList", snapToList);
+      QgsProject::instance()->writeEntry("Digitizing", "/LayerSnappingToleranceList", toleranceList);
+      QgsProject::instance()->writeEntry("Digitizing", "/LayerSnappingEnabledList", enabledList);
+    }
 
   //todo XXX set canvas colour
   emit refresh();