* termhooks.h (mouse_position_hook): Doc fix.

* termhooks.h (mouse_position_hook): Doc fix.
	(set_vertical_scrollbar_hook): This doesn't return anything any
	more, and doesn't take a struct scrollbar * argument any more.
	(condemn_scrollbars_hook, redeem_scrollbar_hook,
	judge_scrollbars_hook): Doc fixes.
	* term.c (mouse_position_hook): Doc fix.
	(set_vertical_scrollbar_hook): This doesn't return
	anything any more.  Doc fixes.
	* keyboard.c (kbd_buffer_get_event): Receive the scrollbar's
	window from *mouse_position_hook and pass it to
	make_lispy_movement, instead of working with a pointer to a struct
	scrollbar.
	(make_lispy_event): We don't need a window_from_scrollbar function
	anymore; we are given the window directly in *EVENT.
	Unify the code which generates
	text-area mouse clicks and scrollbar clicks; use the same code to
	distinguish clicks from drags on the scrollbar as in the text area.
	Distinguish clicks from drags by storing a copy of the lispy
	position list returned as part of the event.
	(button_down_location): Make this a lisp vector, rather than an
	array of random structures.
	(struct mouse_position): Remove this; it's been replaced by a lisp
	list.
	(make_lispy_movement): Accept the scrollbar's window as a
	parameter, rather than the scrollbar itself.
	If FRAME is zero, assume that the other arguments are garbage.
	(syms_of_keyboard): No need to staticpro each window of
	button_down_location now; just initialize and staticpro it.
	* window.c (window_from_scrollbar): Function deleted; no longer
	needed.
	* xdisp.c (redisplay_window): Just pass the window to
	set_vertical_scrollbar hook; don't pass the scrollbar object too.
	* xterm.c (XTmouse_position): Don't return a pointer to the
	scrollbar for scrollbar motion; instead, return the scrollbar's
	window.

	* keyboard.c (apply_modifiers): Don't assume that the Qevent_kind
	property of BASE is set when we first create the new modified
	symbol.  Check that the Qevent_kind property is properly set each
	time we return any symbol.

	* termhooks.h (struct input_event): Replace the frame member with
	a Lisp_Object member by the name of frame_or_window.  Doc fixes.
	Remove the scrollbar member; instead, use frame_or_window to hold the
	window whose scrollbar was clicked.
	* keyboard.c (kbd_buffer_store_event, kbd_buffer_get_event,
	make_lispy_event): Adjust references to frame member of struct
	input_event to use frame_or_window now.
	* xterm.c (construct_mouse_click, XTread_socket): Same.

	* keyboard.c (kbd_buffer_frames): Renamed to
	kbd_buffer_frame_or_window, and made to exist even when
	MULTI_FRAME isn't defined; single-frame systems might have
	scrollbars.  Use it to GCPRO the frame_or_window field in the
	event queue.
	(kbd_buffer_store_event, kbd_buffer_get_event,
	stuff_buffered_input): Set and clear the
	appropriate element of kbd_buffer_frame_or_window, whether or not
	MULTI_FRAME is #defined.
	(read_avail_input): When reading characters directly from stdin,
	set the frame_or_window field of the event appropriately,
	depending on whether or not MULTI_FRAME is #defined.
	(Fdiscard_input, init_keyboard): Zap kbd_buffer_frame_or_window,
	not kbd_buffer_frames.
	(syms_of_keyboard): Initialize and staticpro
	kbd_buffer_frame_or_window, whether or not MULTI_FRAME is
	#defined.

	* keyboard.c (head_table): Make Qscrollbar_movement have a
	Qevent_kind property of Qmouse_movement, not Qscrollbar_movement.

	* keyboard.c (read_key_sequence): If we decide to throw away a
	mouse event which has prefix symbols (`mode-line',
	`vertical-scrollbar', etcetera), remember that we may have to
	unwind two characters, not just one.

	* keyboard.c (read_key_sequence): Doc fixes.

	* keyboard.c (kbd_buffer_store_event): Fix reversed sense of test
	for focus redirection.

	* keyboard.c (read_char): Don't echo mouse movements.