Get rid of DiffEditor::editorWidget();

Change-Id: I3078002359871dad74d4a07924d5beeaeb9f82ba
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/diffeditor/diffeditor.cpp

@@ -85,6 +85,11 @@ Core::Id DiffEditor::id() const
     return Constants::DIFF_EDITOR_ID;
 }
 
+QTextCodec *DiffEditor::codec() const
+{
+    return m_editorWidget->codec();
+}
+
 static QToolBar *createToolBar(const QWidget *someWidget)
 {
     // Create