processing: disconnect canvas signal after building vrt (fixes #15389)

jef-n · jef-n · commit c7b681662761 · 2016-09-28T17:55:27.000+02:00
(cherry picked from commit e963fff)
diff --git a/python/plugins/GdalTools/tools/doBuildVRT.py b/python/plugins/GdalTools/tools/doBuildVRT.py
@@ -78,6 +78,7 @@ def initialize(self):
     def onClosing(self):
         # disconnect from mapCanvas.layerChanged() signal
         self.iface.mapCanvas().layersChanged.disconnect(self.onVisibleLayersChanged)
+        self.iface.mapCanvas().layersChanged.disconnect(self.switchLayerMode)
         BasePluginWidget.onClosing(self)
 
     def onVisibleLayersChanged(self):
