Retrospective commit from 2009-1219.
Fix reordering of Arabic text in etc/HELLO. Extend .gdbinit commands to support bidirectional display. buffer.c (Fbuffer_swap_text): Swap the values of bidi_display_reordering and bidi_paragraph_direction. bidi.c (bidi_resolve_weak): Fix nesting of conditions for Wn processing. Move W3 after W1 and W2. Simplify W4 because it is now always after W1. .gdbinit (pbiditype): New command. (pgx): Use it to display bidi level and type of the glyph.
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