[clangd] Don't show base class versions of members as completions.

Summary:
These are available via qualifiers, but signal to noise level is low.
Keep required quailifier machinery around though, for cross-ns completion.

Reviewers: ioeric

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

Differential Revision: https://reviews.llvm.org/D53571

llvm-svn: 345141

clang-tools-extra/clangd/CodeComplete.cpp

@@ -728,9 +728,9 @@ struct CompletionRecorder : public CodeCompleteConsumer {
     // Retain the results we might want.
     for (unsigned I = 0; I < NumResults; ++I) {
       auto &Result = InResults[I];
-      // Drop hidden items which cannot be found by lookup after completion.
-      // Exception: some items can be named by using a qualifier.
-      if (Result.Hidden && (!Result.Qualifier || Result.QualifierIsInformative))
+      // Class members that are shadowed by subclasses are usually noise.
+      if (Result.Hidden && Result.Declaration &&
+          Result.Declaration->isCXXClassMember())
         continue;
       if (!Opts.IncludeIneligibleResults &&
           (Result.Availability == CXAvailability_NotAvailable ||

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

@@ -381,10 +381,13 @@ TEST(CompletionTest, Qualifiers) {
       void test() { Bar().^ }
   )cpp");
   EXPECT_THAT(Results.Completions,
-              HasSubsequence(AllOf(Qualifier(""), Named("bar")),
-                             AllOf(Qualifier("Foo::"), Named("foo"))));
+              Contains(AllOf(Qualifier(""), Named("bar"))));
+  // Hidden members are not shown.
   EXPECT_THAT(Results.Completions,
-              Not(Contains(AllOf(Qualifier(""), Named("foo"))))); // private
+              Not(Contains(AllOf(Qualifier("Foo::"), Named("foo")))));
+  // Private members are not shown.
+  EXPECT_THAT(Results.Completions,
+              Not(Contains(AllOf(Qualifier(""), Named("foo")))));
 }
 
 TEST(CompletionTest, InjectedTypename) {