Editor: fix disabling modifying actions for read-only editors

Now correctly disables all modifying actions and shortcuts of
texteditoractionhandler if the editor is readonly.

Task-number: QTCREATORBUG-4774
Change-Id: Ic212a2fe3b6dcc18e2fbc461d24bed031c67f6a2
Reviewed-on: http://codereview.qt.nokia.com/7
Reviewed-by: Bill King <bill.king@nokia.com>
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/texteditor/texteditoractionhandler.h

@@ -41,6 +41,7 @@
 #include <QtCore/QList>
 #include <QtCore/QObject>
 #include <QtCore/QPointer>
+#include <QtCore/QList>
 
 namespace TextEditor {
 
@@ -186,6 +187,7 @@ private:
     QAction *m_insertLineBelowAction;
     QAction *m_upperCaseSelectionAction;
     QAction *m_lowerCaseSelectionAction;
+    QList<QAction *> m_modifyingActions;
 
     uint m_optionalActions;
     QPointer<BaseTextEditorWidget> m_currentEditor;