[issue45447] IDLE: Support syntax highlighting for .pyi stub files

[Alex Waygood]

Alex Waygood <Alex.Waygood at Gmail.com> added the comment:

Have posted my PR. I've tested it manually and run the IDLE test suite on it with the `-u all` setting; it seems fine. The new tests I've written are a bit thin on the ground right now, though. I may need some guidance/help if more extensive tests are needed -- I'm a little new to unittest.

One other thing I'm not sure on: the docstring at the top of `browser.py` includes the line "- finish removing limitation to x.py files (ModuleBrowserTreeItem)" in the TODO items. Can this be removed now?

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<https://bugs.python.org/issue45447>
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