Core: Fix crash when closing separate window

Change-Id: I1c9c0644a7ed91b59e86137f80b1f0f534febd47
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/coreplugin/editormanager/editorwindow.cpp

@@ -62,6 +62,12 @@ EditorWindow::EditorWindow(QWidget *parent) :
     updateWindowTitle();
 }
 
+EditorWindow::~EditorWindow()
+{
+    disconnect(m_area, &EditorArea::windowTitleNeedsUpdate,
+               this, &EditorWindow::updateWindowTitle);
+}
+
 EditorArea *EditorWindow::editorArea() const
 {
     return m_area;

src/plugins/coreplugin/editormanager/editorwindow.h

@@ -42,6 +42,7 @@ class EditorWindow : public QWidget
     Q_OBJECT
 public:
     explicit EditorWindow(QWidget *parent = 0);
+    ~EditorWindow();
 
     EditorArea *editorArea() const;