Using the timeline from the API example code, if I call hideDataColumns
(1), then showDataColumns(1), everything works as expected.

But if I recreate the example with a third data series, sometimes a
data series that I hide will not reappear when I call showDataColumns
again.  By hiding and showing it again, it will then reappear.

This occurs 50% of the time, but I haven't quite figured out the
pattern.

Any ideas?

Here is the code I added to the example:

        data.addColumn('number', 'Mine');
        data.addColumn('string', 'title3');
        data.addColumn('string', 'text3');

        data.setValue(0, 7, 10000);
        data.setValue(1, 7, 34045);
        data.setValue(2, 7, 55022);
        data.setValue(5, 7, 75284);
        data.setValue(5, 8, 'New Title');
        data.setValue(5, 9, 'New Text');

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