Editor: Disconnect private editor class when destructing.

Task-number: QTCREATORBUG-15010
Change-Id: Iae3fef08fe0ed42a0eb81cc724f8e5250aedc80d
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>

src/plugins/texteditor/texteditor.cpp

@@ -255,10 +255,7 @@ class TextEditorWidgetPrivate : public QObject
 {
 public:
     TextEditorWidgetPrivate(TextEditorWidget *parent);
-    ~TextEditorWidgetPrivate()
-    {
-        delete m_toolBar;
-    }
+    ~TextEditorWidgetPrivate();
 
     void setupDocumentSignals();
     void updateLineSelectionColor();
@@ -562,6 +559,12 @@ TextEditorWidgetPrivate::TextEditorWidgetPrivate(TextEditorWidget *parent)
     m_extraSelections.reserve(NExtraSelectionKinds);
 }
 
+TextEditorWidgetPrivate::~TextEditorWidgetPrivate()
+{
+    q->disconnect(this);
+    delete m_toolBar;
+}
+
 } // namespace Internal
 
 using namespace Internal;