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"Related to this, if you make two such selections on different vars and review
the checked (selected) samples, you will see that you only get the first or
last, not the union as the radio button suggests."

I don't understand what this is saying.  The union/intersect work for me.

On the 'jarring' action - what is currently happening is that selecting triggers
the form and the 'current selection' is kept track of in python.  It would
likely be better to use javascript during the entire selection process (thus not
requiring a reload) and the apply could read the whole table.

On the multi-select, that would be nice.  I know it requires some (I believe
fancy) javascript but not sure.  You (seth) wouldn't happen to know how to do
that offhand, would you?

On an experiment data tab page, if you select a phenotype var from one of the
drop-down boxes, the page reloads and resets the drop-down box to unset.

The selection made should be set for the reload.

Related to this, if you make two such selections on different vars and review
the checked (selected) samples, you will see that you only get the first or
last, not the union as the radio button suggests.

Furthermore, when the page reloads, you can lose your vertical position on the
page and the result is very jarring and difficult to understand.  If there was a
way to avoid the reload and only reload when the apply button is pressed, that
might be better (or am I misunderstanding the purpose of the apply button).