qgis - Why is the SelectionChanged signal triggered every time i click on the layer?

i'm making some experiments with the SelectionChanged signal of a QgsVectorLayer.

i try this piece of code :

curLayer.selectionChanged.connect(self.test)

and "test" print a warning message.

The probleme i have is that the signal is triggered every time i click on the layer, even when there's no change of selection ...

Is there something i'm missing in this SelectionChanged behaviour ?

Thanks for your help.

Answer

Ok then, after a few searches :

U got to use the two lists provided by the SelectionChanged signal :

QgsFeatureIds selected,QgsFeatureIds deselected (as mentionned in the API doc...)

to check what is really changing in your selection, of course multiple features selection is to take in account ...