Spurious diff due to stub line number changes

[JelleZijlstra]

I have a PR that moves some lines in typeshed, and the mypy-primer diff shows a bunch of line numbers in notes from mypy changing as a result (python/typeshed#14599 (comment)):

- ...typeshed_to_test/stdlib/builtins.pyi:115: note: "SubTest" defined here
+ ...typeshed_to_test/stdlib/builtins.pyi:117: note: "SubTest" defined here

That's not very useful, so it would be nice if we normalized those changes out of the diff.

[brianschubert]

It seems that this is mainly an issue for "defined here" notes? One option could be adding an upstream mypy flag to disable those. There have been other issues raised about these notes in the past, e.g. python/mypy#4773, python/mypy#10480

[JelleZijlstra]

That could work; another (less general) approach is to regex out the line numbers in notes that refer to typeshed paths.