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allow entering nil as value.

(fortran-mode-menu): Reinstate customize entries.

XEmacs code.

frame_or_window slot of TOOL_BAR_EVENT input events instead of
consing.  For prefix events, store the frame in the `arg' slot of
the event, otherwise store the key there.
(XTread_socket): Instead of consing, use the frame_or_window slot
of HELP_EVENTs for the frame, and the `arg' slot for the help
string.

`arg' member of the input event; don't cons.
(menubar_selection_callback): Use the `arg' slot of input events
to queue additional information, instead of consing.

TOOL_BAR_EVENTs.
(w32_read_socket): Adapt to changes in HELP_EVENTs.

input events to queue additional information, instead of consing.

kbd_buffer_frame_or_window.  Now used for all Lisp objects
referenced from the input queue.
(kbd_buffer_store_event): Always use structure assignment for
copying input events.  Record all Lisp objects referenced from
events in kbd_buffer_gcpro.
(kbd_buffer_get_event): Construct Lisp `help-echo' events
differently from input events.  Test for prefix menu_bar_events
and TOOL_BAR_EVENTs differently.  Reset all slots used by an input
event in kbd_buffer_gcpro to nil.
(make_lispy_event) <TOOL_BAR_EVENT>: Treat an input event whose
frame_or_window is equal to its arg member as prefix events.
(stuff_buffered_input): Reset all slots in kbd_buffer_gcpro
used by an input event to nil.
(init_keyboard): Use two times the size of the input queue
for kbd_buffer_gcpro.
(syms_of_keyboard): Likewise.

USER_SIGNAL_EVENT.

(MENU_BAR_EVENT): Renamed from menu_bar_event.
(USER_SIGNAL_EVENT): Renamed from user_signal.

event when deciding what to send to the terminal.

things new in v21.  Remove load-path.  Fix type of
line-number-display-limit.

(scrolling_window): Remove debug code.

MOUSE_FACE_OVERWRITTEN_P to update_window_end_hook function.
(clear_mouse_face): New function pointer member.

current glyph row.
(update_window_line): Add parameter MOUSE_FACE_OVERWRITTEN_P.  Set
it when any row is written to that contains glyphs highlighted in
mouse-face.
(update_window): Call the window update end hook with new
parameter MOUSE_FACE_OVERWRITTEN_P.
(direct_output_for_insert): Give up if row contains mouse-face.

MOUSE_FACE_OVERWRITTEN_P.  If set, arrange for a mouse-highlight
redisplay in XTframe_up_to_date.
(x_clear_mouse_face): New function.
(x_redisplay_interface): Add pointer to x_clear_mouse_face.

Before scrolling, turn off a mouse-highlight in the window
being scrolled.

Obey open_paren_in_column_0_is_defun_start.
When reverting to the `slow' method, try to nicely handle the case
of nested comments by checking that the comment-starter we found
does indeed match the comment-ender.
(scan_sexps_forward, scan_sexps_forward):
Ignore excessive opening parenthesis rather than throwing an error.

in Fwhere_is_internal or get_keymap_1 relocates string contents.

highlight here.
(show_mouse_face): Set the mouse_face_p flag of glyph rows
depending on whether they contain glyphs highlighted in
mouse-face.

displaying a message instead of the minibuffer contents.

(row_equal_p): Add parameter MOUSE_FACE_P.  If set,
compare the mouse_face_p flags of both rows.

(fortran-mode-syntax-table): Defvar directly.
(fortran-font-lock-keywords-1, fortran-font-lock-keywords-2)
(fortran-font-lock-keywords-3, fortran-font-lock-syntactic-keywords):
Use defvar, not defconst.
(fortran-mode-map): Change locals in `let'.  Use `fortran-auto-fill'.
(fortran-mode): Set fortran-comment-line-start-skip,
fortran-comment-line-start-skip, dabbrev-case-fold-search.
(fortran-comment-indent): Use defsubst.
(fortran-indent-comment, fortran-indent-to-column, fortran-break-line):
Use fortran-comment-indent, not fortran-comment-indent-function.
(fortran-comment-region, fortran-electric-line-number): Simplify.
(fortran-auto-fill): New function.
(fortran-do-auto-fill): Deleted.
(fortran-find-comment-start-skip): Check for non-null
comment-start-skip.
(fortran-auto-fill-mode, fortran-fill-statement): Use
fortran-auto-fill.
(fortran-fill): Use fortran-auto-fill.  Check for null
comment-start-skip.  Simplify final clause and use end-of-line finally.

non-zero ok_to_overwrite_keystroke_echo argument.

ok_to_overwrite_keystroke_echo argument.

ok_to_overwrite_keystroke_echo.
(read_char): Call show_help_echo with a zero
ok_to_overwrite_keystroke_echo argument.

byte-compile-current-file only if it is bound.