delete children in ~wxWindow dtor and not in the base class ~wxWindowNative as it's too late there (replaces patch 1082605; closes bug 1068000)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@30959 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/univ/window.h

@@ -73,6 +73,8 @@ public:
                 long style = 0,
                 const wxString& name = wxPanelNameStr);
 
+    virtual ~wxWindow();
+
     // background pixmap support
     // -------------------------
 

src/univ/winuniv.cpp

@@ -179,6 +179,18 @@ bool wxWindow::Create(wxWindow *parent,
     return true;
 }
 
+wxWindow::~wxWindow()
+{
+    m_isBeingDeleted = true;
+
+    // we have to destroy our children before we're destroyed because our
+    // children suppose that we're of type wxWindow, not just wxWindowNative,
+    // and so bad things may happen if they're deleted from the base class dtor
+    // as by then we're not a wxWindow any longer and wxUniv-specific virtual
+    // functions can't be called
+    DestroyChildren();
+}
+
 // ----------------------------------------------------------------------------
 // background pixmap
 // ----------------------------------------------------------------------------