c_gtk_source_gutter_renderer_pixbuf_get_icon_name

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
const(char)* function(GtkSourceGutterRendererPixbuf* renderer) c_gtk_source_gutter_renderer_pixbuf_get_icon_name;

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