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Eli Zaretskii authored
Handle positions at BEGV and ZV. Mor initialization cleanups. xdisp.c (reseat_1): Handle position < BEGV. bidi.c (bidi_paragraph_init): Set bidi_it->ch_len. Handle ZV. (bidi_init_it): Don't initialize bidi_it->ch_len. (bidi_resolve_explicit_1): Abort if bidi_it->ch_len was not initialized. (bidi_at_paragraph_end, bidi_resolve_explicit_1) (bidi_resolve_weak, bidi_level_of_next_char): Handle bytepos at ZV_BYTE. (bidi_resolve_explicit_1): Handle position < BEGV.
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