TypeError: unsupported operand type(s) for &: 'int' and 'KeyboardModifier' when running multiple tests on python 3.11 or 3.8 not using the EDM environment when running python chaco/examples/demo/multiaxis_using_Plot.py

[homosapien-lcy]

Problem Description When running multiple demos using python 3.11 or 3.8 (without EDM), a TypeError: unsupported operand type(s) for &: 'int' and 'KeyboardModifier' will occur after closing the plot window

Reproduction Steps: python chaco/examples/demo/multiaxis_using_Plot.py

Expected behavior: Plot a multiple axis plot without error.

OS, Python version: [MacOS, python 3.11 or python 3.8 (without EDM, the example will pass on EDM)]