show focus on predefined tag if selected via keyboard

[robstoll]

Affected Version

v2.1.1

How to reproduce the problem?

to reproduce:

1. define two simple tags in the project with similar names, say foo1 and foo2
2. start a booking, type f in the tag input field
3. both labels appear
4. select the first by pressing arrow-down
5. tab => foo1 is added as label
6. remove it again
7. type f in the tag input field
8. press arrow-down twice
9. tab => foo2 is added

Describe the bug

The user doesn't see which label has the focus

Expected behaviour

It would be nice if we visually see which one is selected and thus gets added when using tab