ClangCodeModel: Fix more false output arguments with clangd

For some reason, we never checked the actual matching AST node for
const-ness.

Change-Id: Icb58ba169d82e1ec02c9ff8d17f0170f0a78f99d
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: David Schulz <david.schulz@qt.io>

3 files changed, 15 insertions, 0 deletions

diff --git a/src/plugins/clangcodemodel/clangdclient.cpp b/src/plugins/clangcodemodel/clangdclient.cpp
index d0a54042df..50bd7ee24a 100644
--- a/src/plugins/clangcodemodel/clangdclient.cpp
+++ b/src/plugins/clangcodemodel/clangdclient.cpp
@@ -2675,6 +2675,8 @@ static void semanticHighlighter(QFutureInterface<HighlightingResult> &future,
                     || path.rbegin()->kind() == "CXXConstruct")) {
             return false;
         }
+        if (path.rbegin()->hasConstType())
+            return false;
         for (auto it = path.rbegin() + 1; it != path.rend(); ++it) {
             if (it->kind() == "Call" || it->kind() == "CXXConstruct"
                     || it->kind() == "MemberInitializer") {
diff --git a/src/plugins/clangcodemodel/test/clangdtests.cpp b/src/plugins/clangcodemodel/test/clangdtests.cpp
index 6efddf7c20..98e720ba25 100644
--- a/src/plugins/clangcodemodel/test/clangdtests.cpp
+++ b/src/plugins/clangcodemodel/test/clangdtests.cpp
@@ -1298,6 +1298,10 @@ void ClangdTestHighlighting::test_data()
     QTest::newRow("operator<<") << 934 << 10 << 934 << 14 << QList<int>{C_GLOBAL} << 0;
     QTest::newRow("operator>>") << 936 << 10 << 936 << 13 << QList<int>{C_GLOBAL} << 0;
     QTest::newRow("operator>>") << 936 << 17 << 936 << 18 << QList<int>{C_LOCAL} << 0;
+    QTest::newRow("input arg from passed object") << 945 << 17 << 945 << 18
+                                                  << QList<int>{C_FIELD} << 0;
+    QTest::newRow("output arg") << 945 << 20 << 945 << 23
+                                << QList<int>{C_LOCAL, C_OUTPUT_ARGUMENT} << 0;
 }
 
 void ClangdTestHighlighting::test()
diff --git a/src/plugins/clangcodemodel/test/data/highlighting/highlighting.cpp b/src/plugins/clangcodemodel/test/data/highlighting/highlighting.cpp
index 40a4ef23b4..6230e7f039 100644
--- a/src/plugins/clangcodemodel/test/data/highlighting/highlighting.cpp
+++ b/src/plugins/clangcodemodel/test/data/highlighting/highlighting.cpp
@@ -935,3 +935,12 @@ void outputOperator()
     int i;
     std::cin >> i;
 }
+
+template <typename To, typename From, typename Op>
+void transform(const From &from, To &&to, Op op) {}
+struct WithVector { std::vector<int> v; };
+void inputsAndOutputsFromObject(const WithVector &s)
+{
+    std::vector<int> out;
+    transform(s.v, out, [] {});
+}