Only account for WM frame extents in tlw size if WM supports _NET_FRAME_EXTENTS. Extents cache no longer needed.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@50467 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/minifram.cpp

@@ -347,10 +347,6 @@ bool wxMiniFrame::Create( wxWindow *parent, wxWindowID id, const wxString &title
     if (style & wxRESIZE_BORDER)
        m_gdkFunc = GDK_FUNC_RESIZE;
 
-    // need to reset default size after changing m_gdkDecor
-    gtk_window_set_default_size(GTK_WINDOW(m_widget), m_width, m_height);
-    m_decorSize.Set(0, 0);
-
     // don't allow sizing smaller than decorations
     GdkGeometry geom;
     geom.min_width  = 2 * m_miniEdge;