better fix for #5010

Author: alexbruy

python/plugins/fTools/tools/doIntersectLines.py

@@ -51,12 +51,12 @@ def __init__(self, iface):
 
     def populateLayers( self ):
         layers = ftools_utils.getLayerNames([QGis.Line])
-        QObject.disconnect(self.inLine1, SIGNAL("currentIndexChanged(QString)"), self.update1)
-        QObject.disconnect(self.inLine2, SIGNAL("currentIndexChanged(QString)"), self.update2)
+        self.inLine1.blockSignals( True )
+        self.inLine2.blockSignals( True )
         self.inLine1.clear()
         self.inLine2.clear()
-        QObject.connect(self.inLine1, SIGNAL("currentIndexChanged(QString)"), self.update1)
-        QObject.connect(self.inLine2, SIGNAL("currentIndexChanged(QString)"), self.update2)
+        self.inLine1.blockSignals( False )
+        self.inLine2.blockSignals( False )
         self.inLine1.addItems(layers)
         self.inLine2.addItems(layers)