Fix R2L paragraph display on TTY.
xdisp.c (unproduce_glyphs): New function. (display_line): Use it when produced glyphs are discarded from R2L glyph rows. (append_composite_glyph): In R2L rows, prepend the glyph rather than appending it. term.c (append_composite_glyph): In R2L rows, prepend the glyph rather than append it. Set up the resolved_level and bidi_type attributes of the appended glyph.
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