Calling a Refresh() before the window is created no longer

gives an assert. Nothing will happen.
  Added wxTreeCtrl::InsertItem( paret, before, ... ),
  Correct some places with incorrectly indented code.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@5126 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/window.cpp

@@ -2776,8 +2776,7 @@ void wxWindow::WarpPointer( int x, int y )
 
 void wxWindow::Refresh( bool eraseBackground, const wxRect *rect )
 {
-    wxCHECK_RET( (m_widget != NULL), wxT("invalid window") );
-
+    if (!m_widget) return;
     if (!m_widget->window) return;
 
     if (eraseBackground && m_wxwindow && m_wxwindow->window)