Enhanced isinstance narrowing logic to retain type arguments in cas…
#9144
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…es where the filter type (the second argument) is a child of the un-narrowed type and the child has a type parameter that is used multiple times in its base class (e.g. `Child[T](Parent[T, T])`). This addresses #9141.
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Diff from mypy_primer, showing the effect of this PR on open source code: steam.py (https://github.com/Gobot1234/steam.py)
+ /tmp/mypy_primer/projects/steam.py/steam/ext/commands/converters.py:258:29 - error: Type of "message" is partially unknown
+ Type of "message" is "ChatMessage[Unknown, Unknown]" (reportUnknownMemberType)
- 8440 errors, 95 warnings, 0 informations
+ 8441 errors, 95 warnings, 0 informations
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…es where the filter type (the second argument) is a child of the un-narrowed type and the child has a type parameter that is used multiple times in its base class (e.g.
Child[T](Parent[T, T])). This addresses #9141.