Retrospective commit from 2009-10-10.
Continue working on set_cursor_from_row. Disable redisplay optimizations that interfere with R2L glyph rows. Misc cleanups in bidi.c. xdisp.c (set_cursor_from_row): Skip over glyphs near end of row with integer OBJECT even if their CHARPOS is zero. bidi.c (bidi_cache_iterator_state): Don't cache NEW_PARAGRAPH. Abort if someone tries to add a cached state whose position is not the immediate successor to that of the last cached state. (bidi_paragraph_init): Don't bail out too early after a reseat. xdisp.c (text_outside_line_unchanged_p, try_window_id): Disable optimizations if we are reordering bidirectional text and the paragraph direction can be affected by the change.
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