(PER_CHAR_METRIC): Removed.
(x_per_char_metric_1, x_default_char): New functions. (x_per_char_metric): If font's default char is invalid, return metrics of a suitably chosen usable default char. (x_draw_glyph_string_foreground): If font has an invalid default char, replace occurrences of that char with a suitably chosen usable default char.
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