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fix #431: stale pointer for scalar events in nested gop

Jonathan Wilkes requested to merge fix-gop-scalar-events into master

This adds code to send a gobj_vis to each object contained in a graph that has its own window.

Previously, when the window was closed the drawn gobjs didn't receive a gobj_vis to erase themselves. This caused a problem with scalar_vis which has the side-effect of unbinding a symbol.

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