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add-minor-mode call complains in Emacs 21.
Use add-minor-mode to set minor-mode-alist, if available.

(eldoc-echo-area-use-multiline-p): New user option.
(eldoc-echo-area-multiline-supported-p): New variable.
(eldoc-docstring-format-sym-doc): Use them.
(eldoc-mode): If not using idle timers, append to local post and
pre command hooks.  Suggested by David Byers <davby@ida.liu.se>.

(eldoc-display-message-no-interference-p): Don't interfere with edebug.
Add autoload cookie for eldoc-mode minor-mode-alist initialization.

(eldoc-function-arglist): New function.
(eldoc-function-argstring): Use it.

exists before calling directory-files.

^o, ^u.

correct order of priority.  If help echo was found in an overlay,
use that overlay as the object in which the help echo was found.

  The initial property value should be from the position preceding
  POSITION, not following it.

now passed to the function.  It now works properly.

order of priority.

overlay, use that overlay as the object in which the help was
found.

arguments: the pane number and selection number.

	additional arguments OBJECT and POS.

list, take one USER_DATA argument.
(foreach_window_1): Likewise, and call callback functions with two
args, the window and USER_DATA.
(struct check_window_data): New struct.
(check_window_containing): Use it.
(window_from_coordinates): Set up a struct check_window_data for
foreach_window.
(add_window_to_list, freeze_window_start): Change parameters
according to new calling convention.

unibyte string to multibyte if necessary.

(x_set_name): Use x_encode_text.
(x_set_title): Likewise.

on the same display, select that frame, instead of switching to
the Info buffer in another window of the selected frame.

kp-0 to kp-9 and kp-subtract.
(digit-argument): Handle these keys.

stuff -- irrelevant with overlays.  Put an extra property on the
overlays and use it to clean up in case goto-address is re-run.

free.