Aufully flickering push-buttons

It seems that `push-button' widget flickers when displayed on the frame border and is followed by text. To reproduce: (progn (require 'wid-edit) (pop-to-buffer "TMP") (erase-buffer) (widget-insert (make-string 50 ?\ ) "Flickering button: ") (set-frame-property (selected-frame) 'width 72) (widget-create 'push-button :tag "Flicker" :help-echo "Sometimes flickers" :action '(lambda (&rest args) (kill-buffer "TMP"))) ;; Without this dot it does not flicker (widget-insert ".")) It happens with beta-38 on both linux with both motif and athena widgets. On Windows 2000 the above written code results in two buttons -- one on the first line and the second on the second. Nick.