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This is a paintable that wraps a font file, and renders a single glyph. The glyph can be selected by the "glyph" property, but the paintable looks for a glyph with the name "icon0" first, so single-icon fonts can be made to work out of the box. The paintable has properties to set font variations, as well as colors. It implements GtkSymbolicPaintable, and will override the foreground, error, warning and success colors with theme colors when used symbolically.