Fix for ticket #149.

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@5541 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: g_j_m

src/gui/qgsmapcanvas.cpp

@@ -259,8 +259,11 @@ QgsMapLayer* QgsMapCanvas::currentLayer()
 
 void QgsMapCanvas::refresh()
 {
-  clear();
-  updateContents();
+  if (mRenderFlag)
+  {
+    clear();
+    updateContents();
+  }
 } // refresh
 
 void QgsMapCanvas::drawContents(QPainter * p, int cx, int cy, int cw, int ch)