(Fcoordinates_in_window_p): Rewritten.

(Fcoordinates_in_window_p): Rewritten.
(scroll_command): If not acting on current_buffer,
make redisplay consider all windows.
(coordinates_in_window): Rewritten.
(Fdelete_other_windows): Use FRAME_TOP_MARGIN
instead of FRAME_MENU_BAR_LINES.
(check_frame_size): Ditto.
(struct save_window_data): Add frame_toolbar_lines.
(Fcurrent_window_configuration): Save toolbar lines.
(window_from_coordinates): Rewritten.
(Vscroll_preserve_screen_position): Replacement for
scroll_preserve_screen_position.
(window_scroll_pixel_based): New.
(Fsplit_window): Rewritten.
(window_internal_width): Rewritten.
(set_window_buffer): Extracted from Fset_window_buffer,
with an additional argument specifying whether or not hooks may
be called.
(Fset_window_buffer): Call it.
(Fset_window_vscroll): New.
(Fwindow_vscroll): New.
(Fpos_visible_in_window_p): Rewrite.
(change_window_height): Return void.
(make_dummy_parent): Return void.
(init_window_once): Return void.
(syms_of_window): Ditto.
(keys_of_window): Ditto.
(delete_window): Correct return with and without value.
(unshow_buffer): Return void.
(delete_window): Ditto.
(set_window_height): Return void.
(set_window_width): Ditto.
(get_phys_cursor_glyph): New.
(change_window_height): Ditto.
(Fset_window_margins): Ditto.
(window_scroll_line_based): Formerly window_scroll.
(window_scroll): Call both.
(window_topmost_p, window_rightmost_p): Removed because not used.
(Fset_window_margins): New.
(Fwindow_margins): New.
(make_window): Rewritten.
(replace_window): Rewritten.
(Fset_window_configuration): Rewritten.
(get_leaf_windows): New.
(Fdelete_window): Free window matrices.
(Fdelete_window): Adjust glyphs.
(change_window_height): Ditto.