(QCscalable, Qc, Qm, Qp, Qd): New variables.
(syms_of_font): Initialize them. (font_pixel_size): Allow float value in dpi. (font_prop_validate_type): Deleted. (font_prop_validate_symbol, font_prop_validate_style): Argument changed. Caller changed. (font_prop_validate_non_neg): Renamed from font_prop_validate_size. (font_prop_validate_extra): Deleted. (font_prop_validate_spacing): New function. (font_property_table): Add elements for all known properties. (get_font_prop_index): Renamed from check_font_prop_name. New argument FROM. Caller changed. (font_prop_validate): Validate all known properties. (font_put_extra): Argument force deleted. Caller changed. (font_expand_wildcards): Make it static. Fix the way of shrinking the possible range. (font_parse_xlfd): Arguemnt merge deleted. Fix handling of RESX, RESY, SPACING, and AVGWIDTH. Don't validate property values here. Caller changed. (font_unparse_xlfd): Handle dpi, spacing, and scalable properties. (font_parse_fcname): Arguemnt merge deleted. Fix parsing of point size. Don't validate properties values here. Caller changed. (font_unparse_fcname): Handle dpi, spacing, and scalable properties. (font_open_by_name): Delete unused variable. (Ffont_spec): Likewise. Validate property values. (Ffont_match_p): New function.
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