[clangd] Add the missing elaborated types in FindTarget.

Reviewers: sammccall

Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, kadircet, usaxena95, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D74025

(cherry picked from commit eaf0c89)

Author: hokein

clang-tools-extra/clangd/FindTarget.cpp

@@ -374,6 +374,10 @@ struct TargetFinder {
         Outer.add(TT->getAsTagDecl(), Flags);
       }
 
+      void VisitElaboratedType(const ElaboratedType *ET) {
+        Outer.add(ET->desugar(), Flags);
+      }
+
       void VisitInjectedClassNameType(const InjectedClassNameType *ICNT) {
         Outer.add(ICNT->getDecl(), Flags);
       }

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

@@ -242,6 +242,13 @@ TEST_F(TargetDeclTest, Types) {
   )cpp";
   EXPECT_DECLS("TypedefTypeLoc", {"typedef S X", Rel::Alias},
                {"struct S", Rel::Underlying});
+  Code = R"cpp(
+    namespace ns { struct S{}; }
+    typedef ns::S X;
+    [[X]] x;
+  )cpp";
+  EXPECT_DECLS("TypedefTypeLoc", {"typedef ns::S X", Rel::Alias},
+               {"struct S", Rel::Underlying});
 
   // FIXME: Auto-completion in a template requires disabling delayed template
   // parsing.