More fixes for optional activity - the previous fix didn't work for optional activities that were in more than one column (yes 1.0.2 support…
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More fixes for optional activity - the previous fix didn't work for optional activities that were in more than one column (yes 1.0.2 supported a "matrix" layout) and the y co-ord for the overall optional activity isn't reliable - have to take it from the child activities.
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