Description of problem:
When in a particular bug, I want to add a tag. In the add tag box, I start typing a tag name. With a long list of tags, I press the down arrow key to scroll the Tag list. On the fifth press of the down arrow, it starts scrolling down.

Version-Release number of selected component (if applicable):
3.7.0

How reproducible:
100%

Steps to Reproduce:
1. In bug, go to Tags tab, and type in the Add Tag field.
2. Once a list appears, press the down arrow key.
3.
  
Actual results:
The down arrow key works on the fifth press of the key.

Expected results:
The down arrow key works on the first press of the key.

Additional info: