ClangCodeModel: Fix erroneous highlighting as output argument

... for objects with non-const member calls.
Amends 8247f4f3dd.

Fixes: QTCREATORBUG-27306
Change-Id: I13fdf1ff9daf9ac084beda6c1d8ada5801adca4c
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/clangcodemodel/clangdclient.cpp

@@ -2707,9 +2707,15 @@ static void semanticHighlighter(QFutureInterface<HighlightingResult> &future,
         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") {
+            if (it->kind() == "CXXConstruct" || it->kind() == "MemberInitializer")
                 return true;
+
+            if (it->kind() == "Call") {
+                // In class templates, member calls can result in "Call" nodes rather than
+                // "CXXMemberCall". We try to detect this by checking for a certain kind of
+                // child node.
+                const QList<AstNode> children = it->children().value_or(QList<AstNode>());
+                return children.isEmpty() || children.first().kind() != "CXXDependentScopeMember";
             }
 
             // The token should get marked for e.g. lambdas, but not for assignment operators,

src/plugins/clangcodemodel/test/clangdtests.cpp

@@ -1315,6 +1315,12 @@ void ClangdTestHighlighting::test_data()
     QTest::newRow("deref operator (object)") << 960 << 10 << 960 << 11 << QList<int>{C_LOCAL} << 0;
     QTest::newRow("deref operator (member)") << 960 << 12 << 960 << 13 << QList<int>{C_FIELD} << 0;
     QTest::newRow("nested call") << 979 << 20 << 979 << 21 << QList<int>{C_LOCAL} << 0;
+    QTest::newRow("member call on dependent (1)") << 996 << 19 << 996 << 22
+                                                  << QList<int>{C_FIELD} << 0;
+    QTest::newRow("member call on dependent (2)") << 996 << 38 << 996 << 41
+                                                  << QList<int>{C_FIELD} << 0;
+    QTest::newRow("member call on dependent (3)") << 999 << 9 << 999 << 12
+                                                  << QList<int>{C_LOCAL} << 0;
 }
 
 void ClangdTestHighlighting::test()

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

@@ -978,3 +978,24 @@ void nestedCall()
     my_struct* s = get_my_struct();
     new my_struct2(s->method(0));
 }
+
+template<typename T>
+class my_class
+{
+private:
+    struct my_int
+    {
+        int n;
+    };
+
+    std::vector<my_int> vec;
+
+public:
+    void foo()
+    {
+        auto it = vec.begin(), end = vec.end();
+
+        T* ptr = nullptr;
+        ptr->bar();
+    }
+};