QmlJS: Fix infinite loop when scanning for exported C++ types.

Setting extra diagnostics would call updateDocument which would in turn
trigger another scan.

Change-Id: I3810a380cdf716a12767d94ff82dc30f8ae3954d
Reviewed-on: http://codereview.qt.nokia.com/3917
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>
Reviewed-by: Leandro T. C. Melo <leandro.melo@nokia.com>

src/libs/cplusplus/CppDocument.cpp

@@ -603,6 +603,22 @@ void Document::releaseSourceAndAST()
     }
 }
 
+bool Document::DiagnosticMessage::operator==(const Document::DiagnosticMessage &other) const
+{
+    return
+            _line == other._line &&
+            _column == other._column &&
+            _length == other._length &&
+            _level == other._level &&
+            _fileName == other._fileName &&
+            _text == other._text;
+}
+
+bool Document::DiagnosticMessage::operator!=(const Document::DiagnosticMessage &other) const
+{
+    return !operator==(other);
+}
+
 Snapshot::Snapshot()
 {
 }

src/libs/cplusplus/CppDocument.h

@@ -177,6 +177,9 @@ public:
         QString text() const
         { return _text; }
 
+        bool operator==(const DiagnosticMessage &other) const;
+        bool operator!=(const DiagnosticMessage &other) const;
+
     private:
         int _level;
         QString _fileName;

src/libs/cplusplus/ModelManagerInterface.h

@@ -154,6 +154,7 @@ public:
 Q_SIGNALS:
     void documentUpdated(CPlusPlus::Document::Ptr doc);
     void sourceFilesRefreshed(const QStringList &files);
+    void extraDiagnosticsUpdated(QString fileName);
 
 public Q_SLOTS:
     virtual void updateModifiedSourceFiles() = 0;