Bug in zero-length extents

The following code wraps an extent around some text and flags it like so: ->some text<- If you then delete the text you get <--> which is not what I would expect. Anybody know what's going on? XEmacs 21.4.6. (defvar ov nil) (defun add-ov (beg end) (setq ov (make-extent beg end)) (set-extent-properties ov `(face red begin-glyph ,(make-glyph "->") end-glyph ,(make-glyph "<-")))) (defun del-ov () (delete-extent ov)) (add-ov 1 11) (set-extent-property ov 'detachable nil) (delete-region 1 11) The original example used overlays, see <20020128093330.78903f25.Manuel.Serrano(a)sophia.inria.fr&gt; on xemacs-beta and just add the set-extent-property 'detachable sexp for the same results in that context. -- Institute of Policy and Planning Sciences http://turnbull.sk.tsukuba.ac.jp University of Tsukuba Tennodai 1-1-1 Tsukuba 305-8573 JAPAN Don't ask how you can "do" free software business; ask what your business can "do for" free software.