[issue45447] Make IDLE recognize .pyi stub files (and .pyw) as python source

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

I broaden the issue title scope and will correspondingly restrict the PR scope.  'Recognition' applies to open and save dialogs, syntax marking, and module browsing.  (The latter needs fixing for .pyw also.)

Improving the handling of no extension source with initial #! line will be a different issue.

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title: IDLE: Support syntax highlighting for .pyi stub files -> Make IDLE recognize .pyi stub files (and .pyw) as python source

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