Hrvoje Niksic <hniksic(a)arsdigita.com&gt; writes: Well, in Emacs it works like this: when text is inserted and overlays are added, they are not touched by font-lock. When strings with text properties are inserted, however, these text properties will be removed. This is relevant for ansi-color.el: when colors are added via ansi-color-apply-on-region, extents or overlays are used. No problem. When colors are added to string via ansi-color-apply and these strings are inserted into a buffer, font-lock-default-unfontify-region will remove *all* face text properties in Emacs. I looked at the implementation of font-lock-default-unfontify-region in XEmacs. It calls font-lock-remove-face, and there: (put-nonduplicable-text-property start end 'face nil) (put-nonduplicable-text-property start end 'font-lock nil)) That looks as if all face text properties are removed, just like in Emacs. The font-lock text property is not used to prevent this. Cool, I'll do that. Alex.