Retrospective commit from 2009-11-07.
More fixes for iteration near ZV. bidi.c (bidi_paragraph_init): Don't overstep end of buffer. Treat end of buffer as a NEUTRAL_B character. (bidi_resolve_explicit): Don't special-case ZV when bidi_it->type is NEUTRAL_B, since bidi_set_paragraph_end no longer sets the new_paragraph flag.
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