If a PluggableListMorph is given a styled item with the 
addHorzScrollbar changeset loaded, the Text object will eventually get 
given to AbstractFont>>widthOfString:, which doesn't know how to deal 
with it.  I'm not sure who is at fault here (should #widthOfString: be 
able to deal with Text?  Should it make sure to convert its argument to 
a string first?  Should the PLM be converting its items to strings 
before asking about their widths?  Should my code not be giving a Text 
item to a PLM?).

Full debug log is attached.

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