Strange behaviour with ediff & font-lock-mode

Hi all, I've been experiencing a strange behaviour when I ediff two files and have the ediff toolbar enabled as well as ediff-window-setup-function set to ediff-setup-windows-plain, i.e. no separate ediff control panel, but do all in one frame. When I quit ediff, the XEmacs frame's height "shrinks" at the bottom. This is reproducible (at least for me ...): xemacs -vanilla M-x font-lock-mode M-: (setq ediff-window-setup-function (quote ediff-setup-windows-plain)) M-: (setq ediff-use-toolbar-p t) M-x ediff-files It only occurs if at least one of the files is automatically fontified because of its major mode. If e.g. both are plain text files with fundamental-mode as major mode, everything is ok with ediff. Also fine with font-lock-mode set to nil, of course. If I load at least one of the autofontified files *before* calling ediff, things look good. Dito if I first load both files and then call ediff-buffers. Version info: XEmacs 21.5.3 and 21.4.4 on Linux 2.4.7; ediff 1.31. Any clues? TIA, Markus -- Markus Alt IBM Lab Boeblingen, Germany altmark(a)de.ibm.com