Autocomplete suggestions list closes on scroll (in modal dialogues only)

Setup Log in as admin Go to home page, and then click on the cog icon > more> question bank > questions Create 2 true/false questions (q1 & q2) Click on the tag icon next to q1 and 20 tags (t1, t2, ..., t20) to the question Test (Test in Boost, Classic, Clean, and with all supported browsers) Click on the tag icon next to q2 Click on the triangle icon of the tag field Verify that you see t1 ... t20 as suggestions Verify that you can scroll the suggestions list. Try click and drag the scrollbar and also clicking on the up/down arrows of the scrollbar Verify that you can add tags by selecting them from the suggestions list Click on one of the tags in the suggestions box by holding the mouse key down for more than 2 seconds and then releasing the mouse key. Verify that the item you clicked on is added to the tags selection