Update legend item's tooltip (useful when SQL subset has changed)

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@6921 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: wonder

src/app/legend/qgslegendlayer.cpp

@@ -215,6 +215,8 @@ void QgsLegendLayer::updateLayerSymbologySettings(const QgsMapLayer* mapLayer)
 	      (*it)->copySymbologySettings(*mapLayer);
 	    }
 	}
+      // source might have changed - e.g. other subset
+      setToolTip(0, mapLayer->publicSource());
     }
 }