(struct font_name): New member registry_priority.
(split_font_name): Initialize the above member to zero. (concat_font_list): New function. (font_list): Include fonts of all alternative registries. (FONT_POINT_SIZE_QUANTUM): New macro. (better_font_p): Ignore point size difference less than FONT_POINT_SIZE_QUANTUM. Use registry_prioprity as a last resort.
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