Retrospective commit from 2009-10-10.

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.