Now I looked at String >> displayProgressAt:from:to:during: and it was
changed not so long ago from the implementation I suggest [1]. The
reason for the change is Tweak support. We definitely don't want to
break that. But maybe we won't. The change will eventually lead to the
execution of TweakUIBuilder >> displayProgress:at:from:to:during:. We
should ask Matthew Fulmer. What do you think?

Balázs


[1] Here is the commit message:
http://lists.squeakfoundation.org/pipermail/packages/2010-December/004041.html