Fix bug #18778 with slow redisplay of bracketed L2R text with long lines.
src/bidi.c (bidi_cache_reset_to): New function. (bidi_cache_reset): Call it. (bidi_init_it, bidi_line_init): Initialize the bracket_pairing_pos member to -1. (bidi_resolve_explicit): Reset bracket_pairing_pos and bracket_enclosed_type only if bracket_pairing_pos's value is not ZV. (MAX_BPA_STACK): Make sure the value is signed. (PUSH_BPA_STACK): If the BPA stack overflows, don't bail out, but stop pushing values onto the stack. (bidi_find_bracket_pairs): If the bracketed text is only on the base embedding level, remove all the states cached by this function from the cache, and return zero, so that the brackets in this segment of text are processed as normal neutrals. (bidi_resolve_brackets): Detect the brackets that are to be processed as neutrals, and don't call bidi_find_bracket_pairs on them.
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