[clangd] Deduplicate query scopes.

Summary:
For example, when anonymous namespace is present, duplicated namespaces might be
generated for the enclosing namespace.

Reviewers: ilya-biryukov

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

Differential Revision: https://reviews.llvm.org/D54105

llvm-svn: 346224

1 files changed, 17 insertions, 0 deletions

diff --git a/clang-tools-extra/unittests/clangd/CodeCompleteTests.cpp b/clang-tools-extra/unittests/clangd/CodeCompleteTests.cpp
index 3e60b6273a4..03a0f59aa13 100644
--- a/clang-tools-extra/unittests/clangd/CodeCompleteTests.cpp
+++ b/clang-tools-extra/unittests/clangd/CodeCompleteTests.cpp
@@ -1142,6 +1142,23 @@ TEST(CompletionTest, GlobalQualifiedQuery) {
                                           UnorderedElementsAre(""))));
 }
 
+TEST(CompletionTest, NoDuplicatedQueryScopes) {
+  auto Requests = captureIndexRequests(R"cpp(
+      namespace {}
+
+      namespace na {
+      namespace {}
+      namespace nb {
+      ^
+      } // namespace nb
+      } // namespace na
+  )cpp");
+
+  EXPECT_THAT(Requests,
+              ElementsAre(Field(&FuzzyFindRequest::Scopes,
+                                UnorderedElementsAre("na::", "na::nb::", ""))));
+}
+
 TEST(CompletionTest, NoIndexCompletionsInsideClasses) {
   auto Completions = completions(
       R"cpp(