Account for partial properties at existing use sites of partial method symbol APIs

[RikkiGibson]

Test plan: #73090

Issue referenced in source

IDE

roslyn/src/Analyzers/CSharp/CodeFixes/Nullable/CSharpDeclareAsNullableCodeFixProvider.cs

Lines 234 to 240 in f242061

	var symbol = model.GetSymbolInfo(invocation.Expression, cancellationToken).Symbol;
	if (symbol is not IMethodSymbol method || method.PartialImplementationPart is not null)
	{
	// https://github.com/dotnet/roslyn/issues/73772: should we also bail out on a partial property?
	// We don't handle partial methods yet
	return null;
	}

roslyn/src/Features/Core/Portable/Completion/Providers/AbstractPartialMethodCompletionProvider.cs

Lines 93 to 96 in f242061

	// https://github.com/dotnet/roslyn/issues/73772: should we also get partial property symbols here?
	var symbols = semanticModel.LookupSymbols(position, container: enclosingSymbol)
	.OfType<IMethodSymbol>()
	.Where(m => IsPartial(m) && m.PartialImplementationPart == null);

roslyn/src/Workspaces/CSharp/Portable/Rename/CSharpRenameRewriterLanguageService.cs

Lines 827 to 833 in f242061

	// If this is a parameter symbol for a partial method definition, be sure we visited
	// the implementation part's body.
	// https://github.com/dotnet/roslyn/issues/73772: also do this for properties
	if (renamedSymbol is IParameterSymbol renamedParameterSymbol &&
	renamedSymbol.ContainingSymbol is IMethodSymbol methodSymbol &&
	methodSymbol.PartialImplementationPart != null)
	{

roslyn/src/Workspaces/Core/Portable/Rename/ConflictEngine/DeclarationConflictHelpers.cs

Lines 58 to 66 in f242061

	// https://github.com/dotnet/roslyn/issues/73772: add other partial property part as conflicting symbol
	if (isMethod && conflictingSymbol is IMethodSymbol conflictingMethod && renamedMember is IMethodSymbol renamedMethod)
	{
	if (!(conflictingMethod.PartialDefinitionPart != null && Equals(conflictingMethod.PartialDefinitionPart, renamedMethod)) &&
	!(conflictingMethod.PartialImplementationPart != null && Equals(conflictingMethod.PartialImplementationPart, renamedMethod)))
	{
	builder.AddRange(conflictingSymbol.Locations);
	}
	}

roslyn/src/Workspaces/Core/Portable/FindSymbols/FindReferences/Finders/OrdinaryMethodReferenceFinder.cs

Lines 37 to 42 in f242061

	// https://github.com/dotnet/roslyn/issues/73772: define/use a similar helper for PropertySymbolReferenceFinder+PropertyAccessorSymbolReferenceFinder?
	if (symbol.PartialDefinitionPart != null)
	return [symbol.PartialDefinitionPart];
	if (symbol.PartialImplementationPart != null)
	return [symbol.PartialImplementationPart];

roslyn/src/Workspaces/Core/Portable/FindSymbols/FindReferences/Finders/ParameterSymbolReferenceFinder.cs

Lines 244 to 253 in f242061

	// https://github.com/dotnet/roslyn/issues/73772: also cascade partial indexer parameters
	if (parameter.ContainingSymbol is IMethodSymbol method)
	{
	var ordinal = parameter.Ordinal;
	if (ordinal < method.PartialDefinitionPart?.Parameters.Length)
	results.Add(method.PartialDefinitionPart.Parameters[ordinal]);
	if (ordinal < method.PartialImplementationPart?.Parameters.Length)
	results.Add(method.PartialImplementationPart.Parameters[ordinal]);
	}

[RikkiGibson]

I just reviewed this list, I think all the comments listed in the issue are still present in source.

[Cosifne]

I am working on the IDE part. Most of them need some changes.

[RikkiGibson]

Removed entries which were resolved by #73792

[tmat]

Working on EnC support.

[RikkiGibson]

I tried to work through the remaining IDE layer bits in #74950, but I was struggling to understand what to do in some cases. @Cosifne do you think you could pick those up, or maybe we could chat offline about how to work through them.