Fix dmypy inspect for namespace packages #16357
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Diff from mypy_primer, showing the effect of this PR on open source code: discord.py (https://github.com/Rapptz/discord.py): typechecking got 1.10x slower (128.0s -> 141.0s)
(Performance measurements are based on a single noisy sample)
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JukkaL
approved these changes
Oct 30, 2023
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Fixes #15781
The fix is to switch to already resolved paths instead of relying on
crawl_up(). This should be more robust w.r.t. various special cases. I also tweak the tests slightly to show full file names, to have a more consistent output.