[PATCH] Scrollbar visible and placement specifiers

ChangeLog entry for src/ 1998-05-09 Kirill M. Katsnelson <kkm(a)kis.ru&gt; * This change adds four scrollbar specifiers: {horizontal,vertical}-scrollbar-visible-p and scrollbar-on-{top,left}-p. Spare parts supplied by Didier Verna <verna(a)inf.enst.fr&gt; * frameslots.h: Added slots for the four specifier caching. * frame.h: FRAME_SCROLLBAR_{WIDTH,HEIGHT} count for scrollbar visible specifiers. Removed old resource-only controlled scrollbar_on_* ints. * frame-x.c (x_layout_widgets): Removed (to x-scrollbar.el) initialization of old style scrollbar placement from resources. * frame-tty.c (tty_init_frame_1): Removed initialization of old style scrollbar placement. * frame-msw.c (mswindows_init_frame_1): Removed random initialization of scrollbar sizes to 15 pixel. * redisplay-msw.c (mswindows_redisplay_deadbox_maybe): Use scrollbar placement specifiers cached values from window, instead of the old per-frame values. (mswindows_output_vertical_divider): Ditto. * redisplay-x.c (x_output_vertical_divider): Ditto. * redisplay-output.c (redisplay_clear_bottom_of_window): Ditto. * scrollbar.c (update_scrollbar_instance): Ditto. (specifier_vars_of_scrollbar): Declared the four specifiers. * window.h (struct window): Defined slots for caching the new specifiers. * window.c (mark_window): Mark them. (allocate_window): Initialize them. (struct saved_window): Store them in a cool place. (saved_window_equal): Compare them. (save_window_save): Save them. (Fset_window_configuration): Fetch them back. (window_needs_vertical_divider): Check for scrollbar placement using window cached specs. (window_top_gutter_height): Ditto. (window_bottom_gutter_height): Ditto. (window_left_gutter_width): Ditto. (window_right_gutter_width): Ditto. (window_scrollbar_width): Account for scrollbar visibility specification in window. (window_scrollbar_height): Ditto. ChangeLog entry for lisp/ 1998-05-09 Kirill M. Katsnelson <kkm(a)kis.ru&gt; * x-scrollbar.el (x-init-scrollbar-from-resources): Initialize scrollbar-on-{left,top}-p from *scrollBarPlacement resources. * x-misc.el (x-get-resource-and-maybe-bogosity-check): Removed obsolete comment. * scrollbar.el (scrollbars-visible-p): Use new {vertical,horizontal}-scrollbar-visible-p specifiers.