[Etoys] Force TileMorph height

[Yoshiki Ohshima]

> >   I'd be happy to push it as it looks like this is a right solution
> > for a problem, but is there an easy way to see the "sometimes" case?
> > How do I reproduce?
> Also if this change could be forced on old scripts, layout ugliness like 
> attached pict could be history

  Hmm.  It is conceivable.  We have horrible #fixLayout method that
almost do it.  It could traverse the script editor and install the
cell size value.  (Which it should, in case we change the default
font.)

-- Yoshiki