call Show(false) from ~wxDialog to call EndModal if the dialog is still modal consistently in all ports

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51562 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/univ/dialog.cpp

@@ -53,6 +53,11 @@ void wxDialog::Init()
 
 wxDialog::~wxDialog()
 {
+    m_isBeingDeleted = true;
+
+    // if the dialog is modal, this will end its event loop
+    Show(false);
+
     delete m_eventLoop;
 }