Address a few locations also need to care about partial properties

src/EditorFeatures/CSharpTest/SymbolKey/SymbolKeyCompilationsTests.cs

@@ -164,6 +164,34 @@ public partial void M() { }
         Assert.Equal(implementation, ResolveSymbol(implementation, comp, SymbolKeyComparison.None));
     }
 
+    [Fact]
+    public void ExtendedPartialPropertyDefinitionAndImplementationResolveCorrectly()
+    {
+        var src = """
+            using System;
+            namespace NS
+            {
+                public partial class C1
+                {
+                    private int x;
+                    public partial int Prop { get; set; }
+                    public partial int Prop { get => x; set => x = value; }
+                }
+            }
+            """;
+
+        var comp = (Compilation)CreateCompilation(src, assemblyName: "Test");
+
+        var ns = comp.SourceModule.GlobalNamespace.GetMembers("NS").Single() as INamespaceSymbol;
+        var type = ns.GetTypeMembers("C1").FirstOrDefault();
+        var definition = type.GetMembers("Prop").First() as IPropertySymbol;
+        var implementation = definition.PartialImplementationPart;
+
+        // Assert that both the definition and implementation resolve back to themselves
+        Assert.Equal(definition, ResolveSymbol(definition, comp, SymbolKeyComparison.None));
+        Assert.Equal(implementation, ResolveSymbol(implementation, comp, SymbolKeyComparison.None));
+    }
+
     [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/916341")]
     public void ExplicitIndexerImplementationResolvesCorrectly()
     {

src/Features/CSharp/Portable/NavigationBar/CSharpNavigationBarItemService.cs

@@ -73,18 +73,27 @@ private static ImmutableArray<RoslynNavigationBarItem> GetMembersInTypes(
                         continue;
                     }
 
-                    var method = member as IMethodSymbol;
-                    if (method != null && method.PartialImplementationPart != null)
+                    if (member is IMethodSymbol { PartialImplementationPart: { } } methodSymbol)
                     {
-                        memberItems.AddIfNotNull(CreateItemForMember(solution, method, tree, cancellationToken));
-                        memberItems.AddIfNotNull(CreateItemForMember(solution, method.PartialImplementationPart, tree, cancellationToken));
+                        memberItems.AddIfNotNull(CreateItemForMember(solution, methodSymbol, tree, cancellationToken));
+                        memberItems.AddIfNotNull(CreateItemForMember(solution, methodSymbol.PartialImplementationPart, tree, cancellationToken));
                     }
-                    else
+                    else if (member is IPropertySymbol { PartialImplementationPart: { } } propertySymbol)
+                    {
+                        memberItems.AddIfNotNull(CreateItemForMember(solution, propertySymbol, tree, cancellationToken));
+                        memberItems.AddIfNotNull(CreateItemForMember(solution, propertySymbol.PartialImplementationPart, tree, cancellationToken));
+                    }
+                    else if (member is IMethodSymbol or IPropertySymbol)
                     {
-                        Debug.Assert(method == null || method.PartialDefinitionPart == null, "NavBar expected GetMembers to return partial method definition parts but the implementation part was returned.");
+                        Debug.Assert(member is IMethodSymbol { PartialDefinitionPart: null } or IPropertySymbol { PartialDefinitionPart: null },
+                            $"NavBar expected GetMembers to return partial method/property definition parts but the implementation part was returned.");
 
                         memberItems.AddIfNotNull(CreateItemForMember(solution, member, tree, cancellationToken));
                     }
+                    else
+                    {
+                        memberItems.AddIfNotNull(CreateItemForMember(solution, member, tree, cancellationToken));
+                    }
                 }
 
                 memberItems.Sort((x, y) =>

src/Features/Core/Portable/Debugging/AbstractBreakpointResolver.cs

@@ -211,7 +211,7 @@ private IEnumerable<ISymbol> FindMembers(IEnumerable<INamespaceOrTypeSymbol> con
     private IEnumerable<ISymbol> FindMembers(IEnumerable<INamedTypeSymbol> types, NameAndArity nameAndArity)
     {
         // Get the matching members from all types (including constructors and explicit interface
-        // implementations).  If there is a partial method, prefer returning the implementation over
+        // implementations).  If there is a partial method/property, prefer returning the implementation over
         // the definition (since the definition will not be a candidate for setting a breakpoint).
         var members = types.SelectMany(t => GetMembers(t, nameAndArity.Name))
                            .Select(s => GetPartialImplementationPartOrNull(s) ?? s);
@@ -227,8 +227,12 @@ private async Task<IEnumerable<INamedTypeSymbol>> GetAllTypesAsync(CancellationT
         return namespaces.GetAllTypes(cancellationToken);
     }
 
-    private static IMethodSymbol GetPartialImplementationPartOrNull(ISymbol symbol)
-        => (symbol.Kind == SymbolKind.Method) ? ((IMethodSymbol)symbol).PartialImplementationPart : null;
+    private static ISymbol GetPartialImplementationPartOrNull(ISymbol symbol) => symbol.Kind switch
+    {
+        SymbolKind.Method => ((IMethodSymbol)symbol).PartialImplementationPart,
+        SymbolKind.Property => ((IPropertySymbol)symbol).PartialImplementationPart,
+        _ => null
+    };
 
     /// <summary>
     /// Is this method or property a valid place to set a breakpoint and does it match the expected parameter count?