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Closes: #2944
Using such a generic name could lead to collisions with user code as in the linked issue. Here it is changed to a name far less likely to collide with a user subclass and privatized. I'm less sure about making it private but it seems as though doing this will increase future flexibility and clean up what shows up when tab completing on a widget subclass.
I also gave the same treatment to
widget_types
for consistency.