(direct_output_forward_char): #if-0-out redundant

(direct_output_forward_char): #if-0-out redundant
check against truncated text at end of line.
Add giving-up for buffers with reverse direction.
(remake_frame_glyphs): Use FRAME_MESSAGE_BUF_SIZE()
instead of FRAME_WIDTH, as the message may include multi-byte
character and the length may be longer than width.
(width_run_cache_on_off): Disable width-run-cache when
multi-byte characters are enabled.
(skip_invisible): Don't put the boundary in the middle of
multibyte characters.

(direct_output_forward_char): Bug fix.  Add
XFASTINT (w->left) for losing cursor check.

Include charset.h.
(update_line): Handle wide-column characters.