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call compute_motion starting from the former PT if possible.
If PT is unchanged from w->last_point, don't do compute_motion at all.

for non-window displays.

the invisible part of the line beyond the left margin.

when the right margin has been reached.

scroll bar width because it is included in the width; clear
the entire line.

last of the three.

EOL indicator when eol_flag is 0.
(echo_area_display): Use proper width when scroll bars on left.

(redisplay_internal): At the end, if more frames have
become visible, repeat the redisplay.
(decode_mode_spec): Don't display subprocess coding systems.
Don't display EOL for keyboard and terminal coding systems.

buffer-file-coding-system by b->buffer_file_coding_system.

with the newline's face to the end of the newline code.
Add changes (commented out) to record ellipsis positions in charstarts.

Test highlight_nonselected_windows.
(display_text_line): Likewise (in more places).
(syms_of_xdisp): Initialize highlight_nonselected_windows to 0.

window should not show a region.
(redisplay_internal): Do update region_showing when ! all_windows.

macro DISP_CHAR_VECTOR for multibyte characters.

invalid character code, use ' ' (space).
(display_string, display_text_line): Check validity of character
code before calling fix_glyph.

line, when xp.bufpos == ZV.  (This bug is introduced by
changes of Mule).
Compare height against xp.vpos instead of xp.bufpos.
(display_mode_line): Avoid error while compiling with
--with-x=no.
(display_text_line): Correct displaying multi-column
binary data.

rev_dir_bit to display right to left characters (not yet used).

(message): Use FRAME_MESSAGE_BUF_SIZE().
(redisplay_internal): Add canceling code for continuation at
wide-column.
(display_text_line): Don't just decrement left_edge->bufpos,
it may be multi-byte character, use DEC_POS instead.

(try_window): Change the way of calculation of tab
offset.  We now use val.tab_offset to maintain tab offset.
Removed local variable tab_offset.
(try_window_id): Likewise.

(pos_tab_offset): Return COL (Modulo is no longer valid).
Add the line to set tab_offset member.
Use pos.tab_offset.

(redisplay_window): Specify big negative number for TOHPOS
of compute_motion().
(try_window_id): Likewise.

(tri_window_id): Specify "1 << (BITS_PER_SHORT - 1)" to
express "Don't care".

Include charset.h, coding.h, and process.h.
(display_text_line): Handle multibyte characters.
(display_mode_line): Pay attention to wide-column characters.
(decode_mode_spec_coding): New function.
(decode_mode_spec): Handle %-constructs `%z' and `%Z' to print
coding system mnemonics.
(display_string): Handle multibyte characters.

(display_text_line): Likewise, for the taboffset parameter.

(prepare_menu_bars, update_menu_bar):
Call Fmatch_data with new explicit arguments.

scroll a little farther for the sake of scroll_margin.

(init_xdisp): Set up Lisp variable.
(redisplay_window): Implement scroll_margin; don't use old start pos
if point is inside the margin.

(redisplay_window): Obey it.
(syms_of_xdisp): Set up Lisp var.

remove a buffer from base_line_pos if window has switched buffers.

Ignore that many chars from start of overlay strings.
Return updated value in ovstring_chars_done field.

(echo_area_display): Shift display_string past a left-side scroll bar.
(redisplay_window): Likewise.
(redisplay_internal): Shift cursor past a left-side scroll bar.
(redisplay_window): Likewise.
(try_window_id): Likewise.
(display_text_line): Likewise.
(redisplay_internal): Shift charstarts past a left-side scroll bar.
(display_text_line): Likewise.
(redisplay_internal): Use new macro WINDOW_FULL_WIDTH_P.
(redisplay_window): Likewise.
(display_text_line): Likewise.
(display_text_line): Shift output past left-side scroll bar.
(display_text_line): Use new WINDOW_RIGHTMOST_P macro.
(display_text_line): Don't pad right columns unless using
a right-side scroll bar.  Don't draw vertical bars unless there
isn't any kind of scroll bar.
(display_string): Likewise.
(display_mode_line): Use new macros WINDOW_LEFT_MARGIN,
WINDOW_RIGHT_MARGIN, and WINDOW_FULL_WIDTH_P.
(display_string): Use new macro WINDOW_RIGHTMOST_P.

(redisplay_window): Test and update last_overlay_modified field
along with last_modified.

(overlay_unchanged_modified): New variable.
(redisplay_internal): Set overlay_unchanged_modified.

(redisplay_region): Renamed and moved to buffer.c.