ClangCodeModel: Fix erroneous highlighting with clangd

In certain cases, members being initialized were highlighted as output
parameters.

Task-number: QTCREATORBUG-27059
Change-Id: I0de8aee5e4db735251a314b14af04459e6ac772c
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/clangcodemodel/clangdclient.cpp

@@ -2667,6 +2667,11 @@ static void semanticHighlighter(QFutureInterface<HighlightingResult> &future,
         const QList<AstNode> path = getAstPath(ast, range);
         if (path.size() < 2)
             return false;
+        if (token.type == "property"
+                && (path.rbegin()->kind() == "MemberInitializer"
+                    || path.rbegin()->kind() == "CXXConstruct")) {
+            return false;
+        }
         for (auto it = path.rbegin() + 1; it != path.rend(); ++it) {
             if (it->kind() == "Call" || it->kind() == "CXXConstruct"
                     || it->kind() == "MemberInitializer") {

src/plugins/clangcodemodel/test/clangdtests.cpp

@@ -1288,6 +1288,10 @@ void ClangdTestHighlighting::test_data()
                                       << QList<int>{C_LOCAL} << 0;
     QTest::newRow("const operator()") << 903 << 5 << 903 << 7
                                       << QList<int>{C_LOCAL} << 0;
+    QTest::newRow("member initialization: member (user-defined type)") << 911 << 14 << 911 << 18
+                                      << QList<int>{C_FIELD} << 0;
+    QTest::newRow("member initialization: member (built-in type)") << 911 << 23 << 911 << 27
+                                      << QList<int>{C_FIELD} << 0;
 }
 
 void ClangdTestHighlighting::test()

src/plugins/clangcodemodel/test/data/highlighting/highlighting.cpp

@@ -902,3 +902,15 @@ void callOperators()
     Callable2 c2;
     c2();
 }
+
+namespace std { template<typename T> struct atomic { atomic(int) {} }; }
+
+void constructorMemberInitialization()
+{
+    struct S {
+        S(): m_m1(1), m_m2(0) {}
+
+        std::atomic<int> m_m1;
+        int m_m2;
+    };
+}