Thanks Denis, this is close but not totally related.
I finally managed to activate the buttons but this is like vaudou magic to
me:
I create a memory layer, and triggers actionToggleEditing once, and then a
second time but only after having refreshed the canvas.. :
self.iface.setActiveLayer(labelMapLayer )
labelLayer.startEditing()
self.iface.actionToggleEditing().trigger()
# connects label layer attributes values changed to
labelLayerModified function
labelLayer.attributeValueChanged.connect(self.labelLayerModified)
#redraws registry and mapcanvas.
if hasattr(labelMapLayer, "setCacheImage" ):
labelMapLayer.setCacheImage(None )
labelMapLayer.triggerRepaint()
self.iface.legendInterface().refreshLayerSymbology( labelMapLayer )
self.iface.actionToggleEditing().trigger()
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