[Cuis-dev] #submorphBehind: fails

[Phil B]

I've run into a situation a few times where was I getting an unexpected
Morphic-related error. (i.e. when it was trying to find a morph to give
keyboard focus when opening a new morph)  The issue is that
#submorphBehind: sends #after: which fails because there is no element
found.  So just I have #submorphBehind: return nil on error (attached).
It's  running great after 30 seconds of intensive testing ;-)
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