ensure that GetEditControl() returns something even if label editing was started by the user and not the program (#1325) [backport of r53831 from trunk]

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@54419 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/listctrl.h

@@ -435,6 +435,11 @@ private:
     // UpdateStyle()), only should be called if InReportView()
     void MSWSetExListStyles();
 
+    // initialize the (already created) m_textCtrl with the associated HWND
+    void InitEditControl(WXHWND hWnd);
+
+    // destroy m_textCtrl if it's currently valid and reset it to NULL
+    void DeleteEditControl();
 
     DECLARE_DYNAMIC_CLASS(wxListCtrl)
     DECLARE_EVENT_TABLE()