[Gtk-sharp-list] Pango.FontDescription exception

[pinggi]

Hi,

I render text into DrawingArea with double buffering on using Cairo+Pango, like 
this:

                        using (Pango.Layout layout = 
PangoCairoHelper.CreateLayout(c)) {
                                layout.SetText(text);
                                layout.FontDescription = 
Pango.FontDescription.FromString("Sans 9");
                                PangoCairoHelper.LayoutPath(c, layout, true);
                        }

If I increase window size, background becomes black and following text appears 
in the application log:


Cairo.Context: called from finalization thread, programmer is missing a call to 
Dispose
**
GLib:ERROR:gmain.c:2443:g_main_dispatch: assertion failed: 
(current->dispatching_sources == &current_source_link)

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.


If I write it like this...

                        using (Pango.Layout layout = 
PangoCairoHelper.CreateLayout(c)) {
                                layout.SetText(text);
                                using (var fontDesc = 
Pango.FontDescription.FromString("Sans 9"))
                                {
                                        layout.FontDescription = fontDesc;
                                }
                                layout.Alignment = Pango.Alignment.Left;
                                PangoCairoHelper.LayoutPath(c, layout, true);
                        }

...window resizing works ok. Why I need to dispose newly created object? Isn't 
that bad desing of Pango wrapper?
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