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Use != for mtime comparison instead of > #21036

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@mgsloan mgsloan commented Nov 22, 2024

This improves some behavior, but also reveals misbehavior such as #21034.

See "mtime comparison considered harmful" for details of why comparators other than equality/inequality should not be used with mtime.

Release Notes:

@@ -3412,7 +3412,8 @@ async fn test_local_settings(
});
}

#[gpui::test(iterations = 10)]
// TODO(#21034): This test is flaky for some execution orders. Set iterations back to 10 once fixed.
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@mikayla-maki mikayla-maki Nov 22, 2024

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I think we'd prefer to fix this bug as part of this PR, rather than put a TODO on it, unless there's a good reason to suppress the tests (e.g. the tests disabled on Linux due font sizing inconsistencies compared to what we get on macOS )

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Yeah, should probably just do the fix! Unfortunately it may be fairly involved, as it requires the effects of proto::UpdateBufferFile and proto::BufferSaved to be applied together rather than separately. I believe the effects of this would be hard to see in the UI since they are emitted at the same time.

This improves some behavior, but also reveals misbehavior such as #21034.

See ["mtime comparison considered harmful"](https://apenwarr.ca/log/20181113) for details of why comparators other than equality/inequality should not be used with mtime.
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