Fix for crash scenario: If the first thing you do in qgis is open gra…

…ss layer, edit it using grass edit tools then return to work with a non grass layer and touch the canvas qgis crashes because mNonEditMapTool is not initialised.

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@8757 c8812cc2-4d05-0410-92ff-de0c093fc19c

src/app/qgisapp.cpp

@@ -1419,6 +1419,8 @@ void QgisApp::createCanvas()
   mMapTools.mAddRing = new QgsMapToolAddRing(mMapCanvas);
   mMapTools.mAddRing->setAction(mActionAddRing);
   mMapTools.mAddIsland = new QgsMapToolAddIsland(mMapCanvas);
+  //ensure that non edit tool is initialised or we will get crashes in some situations
+  mNonEditMapTool = mMapTools.mPan; 
 }
 
 void QgisApp::createOverview()