[clangd] Handle IndirectFieldDecl in kindForDecl (#80588)

Fixes clangd/clangd#1925

Author: HighCommander4

clang-tools-extra/clangd/SemanticHighlighting.cpp

@@ -136,7 +136,7 @@ std::optional<HighlightingKind> kindForDecl(const NamedDecl *D,
   if (auto *OMD = dyn_cast<ObjCMethodDecl>(D))
     return OMD->isClassMethod() ? HighlightingKind::StaticMethod
                                 : HighlightingKind::Method;
-  if (isa<FieldDecl, ObjCPropertyDecl>(D))
+  if (isa<FieldDecl, IndirectFieldDecl, ObjCPropertyDecl>(D))
     return HighlightingKind::Field;
   if (isa<EnumDecl>(D))
     return HighlightingKind::Enum;

clang-tools-extra/clangd/unittests/SemanticHighlightingTests.cpp

@@ -1076,6 +1076,22 @@ sizeof...($TemplateParameter[[Elements]]);
             using $Class[[Y]]$Bracket[[<]]0$Bracket[[>]]::$Unknown_dependentName[[xxx]];
           };
         };
+    )cpp",
+      // Heuristically resolved IndirectFieldDecl
+      R"cpp(
+        template $Bracket[[<]]typename $TemplateParameter_def[[T]]$Bracket[[>]]
+        struct $Class_def[[Base]] {
+          struct {
+            int $Field_decl[[waldo]];
+          };
+        };
+        template $Bracket[[<]]typename $TemplateParameter_def[[T]]$Bracket[[>]]
+        struct $Class_def[[Derived]] : $Class[[Base]]$Bracket[[<]]$TemplateParameter[[T]]$Bracket[[>]] {
+          using $Class[[Base]]$Bracket[[<]]$TemplateParameter[[T]]$Bracket[[>]]::$Field_dependentName[[waldo]];
+          void $Method_def[[foo]]() {
+            $Field_dependentName[[waldo]];
+          }
+        };
     )cpp"};
   for (const auto &TestCase : TestCases)
     // Mask off scope modifiers to keep the tests manageable.