(start_display): WHen starting display on a continuation
line, clear ascent and descent members of the iterator structure; the height of the continued line does not affect the height of the continuation line. (make_cursor_line_fully_visible): Do nothing if cursor is on a line taller than the window. (redisplay_window) <forced window start>: Handle case that the middle of the window is not found in any row. (dump_glyph_row): Show more information. (compute_line_metrics): Use MATRIX_FIRST_TEXT_ROW to determine the first text line in a glyph matrix.
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