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(display_text_line): Likewise.

(redisplay, redisplay_window): If that var is set, do mode line.
(display_mode_line): Unset the var.
(decode_mode_spec): Set the var if %c was seen.

of clear_face_vector.  Do it at most once per 1000 redisplays.

scan_buffer.

don't call cancel_my_columns unless we will call try_window.

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.

try_window_id, display_text_line, display_menu_bar, decode_mode_spec,
init_xdisp): Don't use XFASTINT as an lvalue.

being displayed, call try_window again.

display_mode_element, decode_mode_spec, display_string): Use type test
macros.

window borders.
* buffer.c (syms_of_buffer): Update doc string for
`buffer-display-table'.
* disptab.h (DISP_TABLE_SIZE): Bump to 262.
(DISP_BORDER_GLYPH): New accessor macro.
* xdisp.c (display_text_line): Consult the display table when
building side-by-side window borders.

(store_frame_title): New function.
(x_consider_frame_title): Format title according to template.
(display_mode_element): Handle frame title as well as mode line.
(decode_mode_spec): Use w->buffer, not current_buffer.

(display_count_lines): Use that.

only if windows_or_buffers_changed.

both current and displayed in selected window.

specially, not current buffer.

(display_mode_line): Likewise.
(prepare_menu_bars): Call it here.