update map extent (as suggested by smizuno in #1314)

git-svn-id: http://svn.osgeo.org/qgis/trunk@9331 c8812cc2-4d05-0410-92ff-de0c093fc19c

src/gui/qgsmapcanvas.cpp

@@ -820,6 +820,7 @@ void QgsMapCanvas::resizeEvent( QResizeEvent * e )
 
     updateScale();
     refresh();
+    emit extentsChanged();
   }
   isAlreadyIn = false;
 } // resizeEvent