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

[Alex Waygood]

Change by Alex Waygood <Alex.Waygood at Gmail.com>:


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keywords: +patch
pull_requests: +27239
stage: test needed -> patch review
pull_request: https://github.com/python/cpython/pull/28950

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45447>
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