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On my computer (Windows 10, screen resolution 3000 x 2000, scaling of text and other elements set at 200% as the recommended value), the path browser is essentially unusable as the items overlap each other. See the attached image. 
I found that changing the following:
 def draw(self, x, y):
 # XXX This hard-codes too many geometry constants!
 dy = 40 # changed from 20
in tree.py solved the problem.