More fixes to bring in line with props.addListener behaviour change

fsl/fslview/controls/imagelistpanel.py

@@ -160,12 +160,14 @@ class ImageListPanel(controlpanel.ControlPanel):
             image.addListener(
                 'name',
                 self._name,
-                lambda c, va, vi, img=image: nameChanged(img))
+                lambda c, va, vi, img=image: nameChanged(img),
+                overwrite=True)
 
             display.addListener(
                 'enabled',
                 self._name,
-                lambda c, va, vi, img=image: enabledChanged(img))
+                lambda c, va, vi, img=image: enabledChanged(img),
+                overwrite=True)
 
         if len(self._imageList) > 0:
             self._listBox.SetSelection(selection)

fsl/fslview/controls/imageselectpanel.py

@@ -129,7 +129,8 @@ class ImageSelectPanel(controlpanel.ControlPanel):
         for image in self._imageList:
             image.addListener('name',
                               self._name,
-                              lambda c, va, vi, i=image: nameChanged(i))
+                              lambda c, va, vi, i=image: nameChanged(i),
+                              overwrite=True)
 
         self._selectedImageChanged()
 

fsl/fslview/gl/slicecanvas.py

@@ -330,6 +330,8 @@ class SliceCanvas(props.HasProperties):
 
             display = image.getAttribute('display')
 
+            # Called when the GL object representation
+            # of the image needs to be re-created
             def genGLObject(ctx=None, value=None, valid=None, disp=display):
                 globj = globject.createGLObject(image, disp)
                 image.setAttribute(self.name, globj)