In gadgets AJAX search suggestion for filters breaks after hyphen

The AJAX Search Suggestions for Filters fails to suggest the result after the special character dash.

Steps to Replicate

1. Create Filter with the name "A-1", "A-2" and " A-3"
2. Create a new dashboard and add gadget "Filter Result" or "Two-Dimensional Filter Statistics"
3. Search Filters, type A and you should able to see all 3 entry
4. type A- and all results still persist
5. Type A-1 returns no result at all