[ 1712381 ] CRASH: closing floating panel on GTK

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@46168 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/aui/framemanager.cpp

@@ -3550,6 +3550,10 @@ void wxAuiManager::OnFloatingPaneActivated(wxWindow* wnd)
 
 void wxAuiManager::OnRender(wxAuiManagerEvent& evt)
 {
+    // if the frame is about to be deleted, don't bother
+    if (!m_frame || wxPendingDelete.Member(m_frame))
+	    return;
+        
     wxDC* dc = evt.GetDC();
 
 #ifdef __WXMAC__