Correctly clears the selectiondialog model after hiding

src/selectiondialog.cc

@@ -38,6 +38,11 @@ void ListViewText::append(const std::string& value) {
   new_row->set_value(column_record.text, value);
 }
 
+void ListViewText::clear() {
+  unset_model();
+  list_store.reset();
+}
+
 SelectionDialogBase::SelectionDialogBase(Gtk::TextView& text_view, Glib::RefPtr<Gtk::TextBuffer::Mark> start_mark, bool show_search_entry, bool use_markup): text_view(text_view), 
 list_view_text(use_markup), start_mark(start_mark), show_search_entry(show_search_entry) {
   if(!show_search_entry)
@@ -117,6 +122,7 @@ void SelectionDialogBase::hide() {
   window->hide();
   if(on_hide)
     on_hide();
+  list_view_text.clear();
 }
 
 void SelectionDialogBase::move() {

src/selectiondialog.h

@@ -17,6 +17,7 @@ public:
   bool use_markup;
   ListViewText(bool use_markup);
   void append(const std::string& value);
+  void clear();
 private:
   Glib::RefPtr<Gtk::ListStore> list_store;
   ColumnRecord column_record;