CppEditor: Fix ConvertQt4Connect for different namespace

Change-Id: I152d7cda02bb034bf817eeeb4b467667e1188b2f
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

src/plugins/cppeditor/cppeditorplugin.h

@@ -130,6 +130,7 @@ private slots:
     void test_quickfix_ConvertQt4Connect_connectOutOfClass();
     void test_quickfix_ConvertQt4Connect_connectWithinClass_data();
     void test_quickfix_ConvertQt4Connect_connectWithinClass();
+    void test_quickfix_ConvertQt4Connect_differentNamespace();
 
     void test_quickfix_InsertDefFromDecl_afterClass();
     void test_quickfix_InsertDefFromDecl_headerSource_basic1();

src/plugins/cppeditor/cppquickfix_test.cpp

@@ -4796,5 +4796,38 @@ void CppEditorPlugin::test_quickfix_ConvertQt4Connect_connectWithinClass()
     QuickFixOperationTest(testDocuments, &factory);
 }
 
+void CppEditorPlugin::test_quickfix_ConvertQt4Connect_differentNamespace()
+{
+    const QByteArray prefix =
+        "namespace NsA {\n"
+        "class ClassA : public QObject\n"
+        "{\n"
+        "  static ClassA *instance();\n"
+        "signals:\n"
+        "  void sig();\n"
+        "};\n"
+        "}\n"
+        "\n"
+        "namespace NsB {\n"
+        "class ClassB : public QObject\n"
+        "{\n"
+        "  void slot();\n"
+        "  void connector() {\n";
+
+    const QByteArray suffix = "  }\n};\n}";
+
+    const QByteArray original = "co@nnect(NsA::ClassA::instance(), SIGNAL(sig()),\n"
+                                "        this, SLOT(slot()));\n";
+    const QByteArray expected = "connect(NsA::ClassA::instance(), &NsA::ClassA::sig,\n"
+                                "        this, &ClassB::slot);\n";
+    QList<QuickFixTestDocument::Ptr> testDocuments;
+    testDocuments << QuickFixTestDocument::create("file.cpp",
+                                              prefix + original + suffix,
+                                              prefix + expected + suffix);
+
+    ConvertQt4Connect factory;
+    QuickFixOperationTest(testDocuments, &factory);
+}
+
 } // namespace Internal
 } // namespace CppEditor

src/plugins/cppeditor/cppquickfixes.cpp

@@ -5783,7 +5783,10 @@ Class *senderOrReceiverClass(const CppQuickFixInterface &interface,
     QTC_ASSERT(objectType, return 0);
 
     ClassOrNamespace *objectClassCON = context.lookupType(objectType->name(), objectPointerScope);
-    QTC_ASSERT(objectClassCON, return 0);
+    if (!objectClassCON) {
+        objectClassCON = objectPointerExpressions.first().binding();
+        QTC_ASSERT(objectClassCON, return 0);
+    }
     QTC_ASSERT(!objectClassCON->symbols().isEmpty(), return 0);
 
     Symbol *objectClassSymbol = skipForwardDeclarations(objectClassCON->symbols());