The minus sign on family selector does not actually remove the family.

[haihan-lin]

Steps to reproduce

1. select a bunch of families from the family selector
2. click the minus sign

Observed behavior

After selecting several families, there are minus signs in family selector on selected families. But clicking the minus sign only makes that family as the only selected family, instead of remove the family from the selected ones.

Expected behavior

By clicking the minus sign, actually only remove the family.