more gutter useability improvements

Thanks to Jan. This improves the useability changes somewhat. andy 2000-02-27 Andy Piper <andy(a)xemacs.org&gt; * gutter-items.el (update-tab-hook): new function to be used for hooks. (create-frame-hook): add update-tab-hook. (record-buffer-hook): ditto. (default-gutter-position-changed): ditto. (default-gutter-position): updating the buffers tab is now handled by a hook. (default-gutter-position-changed-hook): new variable. (gutter-element-visibility-changed-hook): ditto. (set-gutter-element-visible-p): call it. (set-gutter-element): use modify-specifier-instances. Set extents as duplicable before using. (remove-gutter-element): ditto. (set-gutter-element-visible-p): ditto. (init-gutter): new function. (add-tab-to-gutter): use new gutter-element functions rather than setting specifiers directly. (clear-progress): ditto. (abort-progress): ditto. (gutter-buffers-tab-visible-p): renamed from default-gutter-visible-p * specifier.el (modify-specifier-instances): new function from Jan Vroonhof. * x-init.el (init-post-x-win): call init-gutter. * msw-init.el (init-post-mswindows-win): call init-gutter. * menubar-items.el (default-menubar): Update to reflect new gutter variables. * gutter.c (Fset_default_gutter_position): don't default left and right gutter visibility to t. (Fset_default_gutter_position): run default-gutter-position-changed-hook. (syms_of_gutter): add default-gutter-position-changed-hook. -------------------------------------------------------------- Dr Andy Piper Senior Consultant Architect, BEA Systems Ltd