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inside the scroll margin put point at bottom of it, not at window
start.

(change_window_height): Fix one-off comparing DELTA with MAXIMUM.

(save_window_save): Convert Fset_marker argument to Lisp_Integer.

(Fset_window_configuration): Block input around frobbing the frame.
Preseve point in the current buffer if we do not switch to a different one.

(inhibit_frame_unsplittable): Variable deleted.
(syms_of_window): Don't set up Lisp variable.

in the new selected window's new buffer.

look again for a window in those frames already showing BUFFER.

(Fsplit_window): Ignore `unsplittable' if frame_allow_splitting.
(syms_of_window): Set up Lisp var.

(Fset_window_buffer, Fdisplay_buffer): Don't use Lisp_Object as integer.

(Vwindow_configuration_change_hook): New variable.
(syms_of_window): Initialize; set up Lisp var.
(delete_window): New subroutine, from Fdelete_window.
Most callers changed.
(Fdelete_window): Call Vwindow_configuration_change_functions.
(Fset_window_buffer, Fenlarge_window, Fshrink_window):
Call the Vwindow_configuration_change_functions.
(Fset_window_configuration): Likewise.

negative number for the argument TOHPOS of compute_motion().
We don't need to calculate to (HPOS==0), but can stop immediately
when VPOS pasts HEIGHT.

nearest ones first, when that can be done without deleting any of them.

(keys_of_window): Set up Lisp var.
(window_scroll): If scroll_preserve_screen_position is 0,
behave the old way (advancing point the minimum distance).

if we cannot preserve the actual position of it.
Make it static.  New arg WHOLE; callers changed.

newlines and backslashes in help strings.

by putting point at a place that won't force recentering.

Don't find any minibuffer window
except the one that is currently in use.

(Fdisplay_buffer): Use them, instead of doing the work here.
(syms_of_window): Defsubr them.

(coordinates_in_window): Use WINDOW_LEFT_MARGIN, WINDOW_RIGHT_MARGIN,
and WINDOW_RIGHT_EDGE.  Adjust for left-side scroll bar margin.
(window_loop, Fdisplay_buffer): Use new WINDOW_FULL_WIDTH_P macro.
(window_internal_width): Window width now always includes the
scroll bar, if any.  Use WINDOW_RIGHTMOST_P and WINDOW_FULL_WIDTH_P.

(set_window_height, set_window_width, Fset_window_buffer)
(change_window_height, window_scroll, Fset_window_configuration):
Clear last_overlay_modified field.
(Fpos_visible_in_window_p): Test last_overlay_modified field.

(Fset_window_buffer): Set last_selected_window slot.
(Fselect_window): Set last_selected_window slot.
(delete_all_subwindows): Maybe call unshow_buffer.

no special handling for scroll bars.

placeholder member is EMACS_INT, not int.