(zv_height, zv_bits, zv_period): Changed zv bitmap to
fill fringe evenly with small dashes. (x_draw_fringe_bitmap): Clear background if necessary. Align and clip the new ZV bitmap to avoid jitter between rows. (x_draw_row_fringe_bitmaps): Rely on x_draw_fringe_bitmap to clear background. Don't draw fringe bitmaps if fringe width is zero. (x_compute_fringe_widths): New function. (x_new_font, x_set_window_size_1): Use it.
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