#30 Keep expanded trees during refresh

[Gilles Scokart]

After a re-compilation, the view always apears
collapsed, whatever wath was visible before.

It would be nice that only the figures changes, and the
visible/expanded metrics stays unchanged.

For example, if I modify a function to reduce one
particular metric, I want this function metric to stay
visible between each recomputation. But now I have to
re-expand the tree to re-view it at each Save.

[Frank Sauer]

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good idea, not sure how to do this, but will try