[PyQt] Any way to capture the signal for a QTreeWidgetItem's checkbox state change

[Nate Reid]

I have a QTreeWidget with QTreeWidgetItems whose columns have checkboxes in them. If I click on the checkbox and toggle it, I get the same 'itemClicked' signal, whether or not the state of the checkbox actually changes.  Is there a hook into the actual state change of the checkbox, not just the click that the QTreeWidget recieves?
-Nate
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