Retrospective commit from 2009-12-26.
Redesign handle_stop_backwards. Fix character mirroring for non-ASCII characters. xdisp.c (handle_stop_backwards): Call compute_stop_pos in the loop, instead of calling handle_stop. Call handle_stop only once, after the loop. (next_element_from_buffer): Don't call handle_stop_backwards if at stop position. If base_level_stop is zero, set it to 1. term.c (append_glyph): Fill resolved_level and bidi_type slots of struct glyph for unidirectional display. xdisp.c (set_cursor_from_row): Handle zero-width characters. bidi.c (bidi_mirror_char): More efficient code (suggested by Ehud Karni <email@example.com>). Don't even try to mirror non-ASCII characters.
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