[3.10] bpo-45447: Add syntax highlighting for .pyi
files in IDLE (GH-28950)
#31303
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Also add .pyi to the python extensions in the "File-open" and "File-save" dialogues.
Add util.py to contain objects that are used in multiple idlelib modules
and have no dependencies on any of them.
Co-authored-by: E-Paine 63801254+E-Paine@users.noreply.github.com
Co-authored-by: Terry Jan Reedy tjreedy@udel.edu
(cherry picked from commit 50cf499)
https://bugs.python.org/issue45447