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take this shortcut if ZV is visible in the window.
(try_window_id): When checking for window start being in changed
text, don't check that the buffer's size has changed.

insertion at EOB as if it were "off the bottom of the screen."

window_end_vpos.

the case that lines were deleted at the end of the window.
Add some more debug_method_adds.

the window start.

the window start or all below the window end mostly rewritten.
(redisplay_window): Move the tests if try_window_id is
applicable to try_window_id.
(GIVE_UP): New macro.

and window_end_bytepos were not adjusted.

matrix of mini-windows.

instead of using it.last_visible_y for the height of the window.

the change of window_internal_height into account.

the buffer that was used for echoing.

(set_iterator_to_next): If a string from a display property ends,
consider the case that this might also be the end of an
overlay string having the display property.

lists.

(Qinhibit_eval_during_redisplay): New variables.
(safe_eval, safe_call): If inhibit_eval_during_redisplay is set,
don't eval, return nil instead.
(syms_of_xdisp): DEFVAR_BOOL inhibit-eval-during-redisplay.
Initialize Qinhibit_eval_during_redisplay.

the iterator's multibyte_p flag.

Give up if matrix starts in an ellipsis.
(init_from_display_pos): Do nothing if POS doesn't specify
a dpvec_index but the iterator has such a position.

(init_from_display_pos): Use it.
(try_window_reusing_current_matrix): Don't use cursor_row_p.

with TEXT_PROP_MEANS_INVISIBLE instead of NILP.

last_arrow_position and last_arrow_string are set.

extracted from mark_window_display_accurate.  Compute
BUF_UNCHANGED_MODIFIED, BUF_OVERLAY_UNCHANGED_MODIFIED,
BUF_BEG_UNCHANGED, BUF_END_UNCHANGED.
(mark_window_display_accurate): Use it.
(redisplay_internal): Use it for the selected window.
(redisplay_internal): Avoid duplicate mark_window_display_accurate
for the selected frame.

(try_window_reusing_current_matrix): Use cursor_row_p.
(try_window_reusing_current_matrix) <scrolling up>: Fix disabling
of rows.
(init_from_display_pos): If POS specifies a position in a display
vector, maybe get the iterator set up for that ellipsis.

(string_buffer_position): Use `make_number'.

is an integer don't have to be for space characters.

skip the padding blanks inserted in extend_face_to_end_of_line,
before checking for trailing whitespace.

(single_display_prop_string_p): New functions.

instead of nil.

(display_string): Call face_at_string_position with new
parameter.

if face_change_count is non-zero.

at the start of the function, check that the \n in it->c is
from the iterator's current position.

DISPLAY_REPLACED_BEFORE_P.  If it is non-zero ignore display
properties which replace the display of text with something else.
(handle_display_prop): Call handle_single_display_prop with
additional argument saying if we already replaced text display
with something else.  Use AREF.
(with_echo_area_buffer_unwind_data, display_menu_bar)
(decode_mode_spec_coding): Use AREF and ASIZE.

mark_window_display_accurate after all windows have been
redisplayed because this call resets flags in buffers which are
needed for proper redisplay.