* xdisp.c (redisplay_window): Invalidate width_run_cache, if the
buffer's display table doesn't match the width table the cache was built for. (display_text_line): Use compute_motion to skip forward to the left edge of the window when the window is hscrolled; this is faster than rendering all the characters into the bit bucket when the hscroll is large. Doc fixes. (display_count_lines): Call scan_buffer with new args.
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