Dear Bug Team! this defect shows with any xemacs version I tried from 21.4 to 21.5.27. It is easily reproduced by evaluating the following lisp code. (attached you find a screen shot of a xemacs session showing the buffer produced by this code, both correctly and incorrectly drawn): --- start of sample --- (let* ((pattern "0123456789ABCDEF") (max (length pattern)) (buffer (get-buffer-create "*glyph-clipping-bug*")) i) (switch-to-buffer buffer) (erase-buffer) (setq i 0) ;; 4 is sufficient to see the effect. ;; 50 shows the same in slow motion, and you may scroll ;; several times to see variations of the theme (while (< i 50) (insert "Scroll down\nwith mouse wheel\nand watch\nclipping effect.\n") (setq i (1+ i))) ;; create test glyphs (goto-char (point-min)) (while (not (eobp)) (setq i (1+ (% i max))) (let ((extent (make-extent (point) (point-at-eol)))) (set-extent-property extent 'end-glyph (make-glyph (vector 'layout :orientation 'horizontal :vertically-justify 'top :horizontally-justify 'left :pixel-height 16 :items (list (vector 'button :descriptor (substring pattern 0 i) :callback '(message "hello world") :pixel-height 16 :face 'bold) (vector 'button :descriptor (substring pattern 0 i) :callback '(message "hello world") :pixel-height 16 :face 'bold) (vector 'button :descriptor (substring pattern 0 i) :callback '(message "hello world") :pixel-height 16 :face 'bold))))) (set-extent-property extent 'end-glyph-layout 'inside-margin) (forward-line))) (goto-char (point-min))) -- end of sample --- The example is overdoing things to make the effect more dramatic. Anyway, just eval the code to get a buffer with glyphs running down the right window margin. As soon as you scroll downwards with the mouse wheel (i.e. 5 lines of text in one go) you will see for yourself ... Besides the clipping defect, the example also makes a rather bad performance of the redisplay of glyphs evident. There is a noticeable flickering of the button windows until the redisplay comes to a rest after each scroll, while from the X11-point of view basically only a movement of the X-windows without any need for a redisplay or geometry changes seems necessary. Hope you can do something about the clipping at least. Many thanks for your efforts. Cheers, Klaus _______________________________________________ XEmacs-Beta mailing list XEmacs-Beta(a)xemacs.org http://calypso.tux.org/cgi-bin/mailman/listinfo/xemacs-beta