(setq tool-bar-button-margin 0) makes GTK Emacs go crazy

[Katsumi Yamaoka]

Hi,

I recently built Emacs configured with the --with-gtk option and
noticed I must not set `tool-bar-button-margin' to zero (I do so
for LUCID Emacs to make the tool bar compact).  It causes Emacs
to go on and off wildly.  If you try it, launch another Emacs.

Although it might be impossible to make `tool-bar-button-margin'
and `tool-bar-button-relief' affect the GTK tool bar, I hope it
is improved in the future.

Regards,