Comment 3 for bug 1780487

There is no value in clicking on a footprint library if the filter is off. So I think if one /does/ click on a library, it's clear enough that they want the filter on. No need to wait for a double click.

Turning off the filter I think is still easiest by using the filter button.

So I wouldn't be inclined to add any double-click processing; selection should just turn the filter on.