extent glyphs and visibility

Nathan Sidwell writes: But that seems like correct behavior to me, since glyphs attached to an extent are outside the extent. The definition of an extent's "invisible" property refers to visibility of the text, which presumably means the buffer contents. Definition of what should happen in the case of extents which happen to share an endpoint is very unclear to me. Personally, I would interpret those glyphs as being outside of both extents, the glyph-carrier and the extent that contains the glyph-carrier. That said, I'm inclined to apply the patch provided (1) it doesn't break other applications (the important one I can think of is preview-latex), and (2) it is understood that behavior may change in the future. Why might behavior change? Note that "outside" can mean *way* outside. I don't think I want the glyph to disappear in the following: ;; make a visible mark in the left margin (set-specifier left-margin-width 2 (current-buffer)) (set-extent-properties (make-extent (point) (point)) `(begin-glyph '(make-glyph ">") begin-glyph-layout 'outside-margin)) ;; hide the text containing the mark, but not the mark (set-extent-properties (make-extent (1- (point)) (1+ (point))) '(invisible t)) This currently doesn't work, but I've always considered that a bug. Note that I think that reasonable behavior would be if invisibility of containing extents applied to glyphs with 'text layout, but not 'whitespace, 'inside-margin, or 'outside-margin. Yeah, what it tells is that nobody has really thought this stuff through. I'd really like a spec of what should happen in the various cases where extents share endpoints and the glyph's layout is 'text. Without a spec to work to, I can easily see someone coming up with an application that doesn't work as desired wanting to change it again. _______________________________________________ XEmacs-Patches mailing list XEmacs-Patches(a)xemacs.org http://calypso.tux.org/cgi-bin/mailman/listinfo/xemacs-patches