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FRAME_X_WINDOW (f) being null at the of the function.  If widgets
cannot be created we will already have crashed earlier.  Call
lw_set_main_areas with a null menu-bar widget, so that we have
a reasonable default.
(Fx_create_frame): Rearranged so that Lisp errors during frame
initialization cause less damage.  Initialize menu bar widget
here.

the default so that beginners can benefit from it without
searching in manuals.

whole line clear to end of frame.

(redisplay_internal): Register unwind_redisplay with
register_unwind_protect.
(try_window_reusing_current_matrix): If new start > old start,
give up if start pos of first reusable row is not equal to new
start.

and `right-bitmap-area' if position is in the bitmap areas.  This
avoids an error when clicking on the bitmap areas.  Instead, they
are currently treated like clicks inside the window.
(coordinates_in_window): Return 5 and 6 for bitmap areas.
(Qleft_bitmap_area, Qright_bitmap_area): New.
(syms_of_window): Initialize new symbols.

don't write trailing spaces unless we must.

C-q.  If it's bound call that binding, otherwise call
toggle-read-only.

(info-lookup-guess-default*): DTRT for point st start of symbol.
(info-complete): Don't lose with point not at end of symbol.

write the whole line.

(Vshow_trailing_whitespace): Added.
(init_iterator): Remove initialization code for
show_trailing_whitespace_p.
(redisplay_internal): Don't try cursor movement in this_line
if showing trailing whitespace.
(redisplay_window): Likewise for cursor movement in current
matrix and try_window_id.
(try_window_reusing_current_matrix): Likewise.
(trailing_whitespace_p): Return 0 if trailing whitespace is
in front of point.
(display_line): Use Vshow_trailing_whitespace instead of
former iterator member show_trailing_whitespace_p.
(syms_of_xdisp): Add DEFVAR_LISP for show-trailing-whitespace.

Vshow_trailing_whitespace instead of former iterator member
show_trailing_whitespace_p.
(direct_output_forward_char): Don't do it if hightlighting
trailing whitespace.

show_trailing_whitespace_p.

of the glyph string for the width of the box.

Don't display messages in echo area.

The code relied on the fact that Emacs ignored invalid faces in
face text properties in 20.4.

(three-step-help): Customize.

scroll-down-aggressively.

background first, and then set other parameters that might
depend upon their new values.

(mldrag-drag-mode-line, mldrag-drag-vertical-line): New aliases,
marked obsolete.

(jit-lock): Add :version.

(find-file): Doc fix.