Analyzer produces duplicate IL2092 for default interface method

[vitek-karas]

			interface IBaseWithDefault
			{
				void DefaultMethod (Type type);
			}

			interface IDerivedWithDefault : IBaseWithDefault
			{
				[ExpectedWarning ("IL2092")]
				[ExpectedWarning ("IL2092", ProducedBy = ProducedBy.Analyzer)] // Analyzer produces the warning again
				void IBaseWithDefault.DefaultMethod ([DynamicallyAccessedMembers (DynamicallyAccessedMemberTypes.PublicMethods)] Type type) { }
			}

			class ImplDerivedWithDefault : IDerivedWithDefault
			{
			}

This is because the analyzer uses symbol action (so called for every symbol). In this case it's called for ImplDerivedWithDefault and then for IDerivedWithDefault and both return the DefaultMethod override pair (the exact same pair) from their call to GetMemberInterfaceImplementationPairs.

[vitek-karas]

Probably low priority - it's just a bit of noise and in a very rare scenario.

[sbomer]

NativeAot has a similar bug - it will produce duplicate warnings when there are multiple classes like ImplDerivedWithDefault, since it produces the warnings from the EETypeNode for that class.

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