I'm trying to understand CompositionView, with a view to converting it 
to pure QT4.
It's very clever and mighty complicated!

I think I've got the general idea - it's a ScrollView containing a 
viewport whose size is defined on modification and onto which widgets 
are drawn.

One thing I'm struggling to find at the moment is how the horizontal 
lines between the tracks are constructed.

Does anybody here know?

Regards
CJ

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