Throughout the file, delete all USE_FONT_BACKEND
conditionals. Don't check enable_font_backend. Delete all codes used only when USE_FONT_BACKEND is not defined. (handle_auto_composed_prop): Do nothing if it->f is not on a window system. Check how many following characters can be displayed by the same font. (calc_pixel_width_or_height): Type of the 4th arg is changed to 'struct font *'. (get_char_face_and_encoding): Assign the whole encoding task to the `encode-char' method of a font driver. (fill_composite_glyph_string): Adjusted for the change of `struct face' and `struct glyph_string'. (fill_glyph_string): Likewise. (get_per_char_metric): Arguments changed. (x_get_glyph_overhangs): Adjusted for the change of `struct face' and `struct glyph_string'. (produce_stretch_glyph, calc_line_height_property) (x_produce_glyphs): Likewise.
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