Stacked line updating bug

[freeman-lab]

When generating a stacked line visualization inside of an existing feed with other chart types (confirmed with both scatter and line), the visualization fails to update properly when a new line is selected. Most likely a scoping problem.

Steps to reproduce (from the Python client);

lgn.line(random.randn(5,20))
lgn.linestacked(random.randn(5,20))

Now try selecting new lines from the minimap: they appear, but the correct transition isn't triggered.