TextEditor: add a virtual destructor to TextSuggestion

Change-Id: I30378a5a3367a79eb3b39bc921c409ca0af04119
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/texteditor/textdocumentlayout.h

@@ -46,6 +46,7 @@ class TEXTEDITOR_EXPORT TextSuggestion
 {
 public:
     TextSuggestion();
+    virtual ~TextSuggestion();
     virtual bool apply() = 0;
     virtual void reset() = 0;
     virtual int position() = 0;