I think the key problem is to differentiate the position we right-click on
the GraphWidget area. Now the case is wherever i right-click, the
button_press_event cancel the selected node. It cannot check if we
right-click on the selected node or I move away and right-click on the other
places. Usually people want to have some operations on the selected node
with a right-click menu, otherwise unselect it. :)
I tried to handle this within the branch of event.button == 3, check the pos
of the self.picked and my current self.pointer value. But it doesn't work.
In principle,
if pos of self.picked is somehow the same as self.pointer:
then it means "right-click on selected node"
else:
it means "right-click on other area, and I want to unselect the node"
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