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

[Terry J. Reedy]

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

For the open dialog, we only need the expanded extension list.  People with no-extension python code file must select 'all files'.  Once the file is open, we need the issource function to decide whether to turn on the colorizer.  I intend to review the patch itself tomorrow.

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