test the transparency
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@@ -168,7 +168,7 @@ DrawerManager::DrawerManager(GtkWidget * widget, int32_t x, int32_t y)
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// http://cairographics.org/FAQ/#clear_a_surface
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// http://gtk.developpez.com/faq/?page=gtkwidget#GTK_WIDGET_transparent
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cairo_set_source_rgba(m_cairo, 0, 1, 1, 0.5);
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cairo_set_source_rgba(m_cairo, 0, 1, 1, 0);
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cairo_set_operator(m_cairo, CAIRO_OPERATOR_SOURCE);
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cairo_paint(m_cairo);
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//cairo_fill(m_cairo);
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