Add suppression if nowarn differs #23652
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Fixes #23651
The previous fix for the same
@nowarnattached to multiple elements should have compared theannotPosto identify duplicates (instead of the target range).This commit defers detecting "bad" or duplicate suppressions (which originate with the same annotation) to report time, after the suppression is "unused"; there are few nowarns per file and fewer that are unused.
While checking for a suppression, mark matching unused suppressions as "superseded", so that if they remain unused, the warning can add an "audit" that the nowarn matched a diagnostic (but was superseded by some other nowarn).
This commit goes further and checks for duplicates (including whether the filters look the same).If it finds a duplicate where theannotPosdiffers, warn about the user-written annotation.Filters match each other if they are the same type and, if they have a pattern, the string representations of the patterns are equal.