Fix cursor motion in bidi-reordered continued lines.
xdisp.c (try_cursor_movement): Backup to non-continuation line only after finding point's row. Fix the logic. Rewrite the loop over continuation lines in bidi-reordered buffers. Return CURSOR_MOVEMENT_MUST_SCROLL upon failure to find a suitable row, rather than CURSOR_MOVEMENT_CANNOT_BE_USED.
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