Contrast selector in Statistics Test Setup from dropdown list to checkbox format

[cliandouble08]

The dropdown format is extremely inconvenient when selecting multiple contrasts. The dropdown menu closes every time when a contrast is selected.

[nmclark2]

I have played around with this a lot. The issue with the checkbox selection is that it overflows the window. There is no way to get the pickerInput to not close after selection due to the reactive nature. If you would like to investigate if you can get the pickerInput to stay open please go ahead and try, but I tried for many hours and could not come up with a solution.

While inconvenient, I think the current implementation is the cleanest it can be.