Add EnableCloseButton() as wxMSW does. Use it in

wxProgressDialog so that without wxPD_CAN_ABORT
    you cannot close the dialog.
  Closes [ 1585563 ] wxProgressDialog @ GTK CloseButton


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42493 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/toplevel.h

@@ -51,6 +51,8 @@ public:
     virtual void SetIcons(const wxIconBundle& icons);
     virtual void Restore();
 
+    virtual bool EnableCloseButton(bool enable = true);
+
     virtual bool ShowFullScreen(bool show, long style = wxFULLSCREEN_ALL);
     virtual bool IsFullScreen() const { return m_fsIsShowing; };