Description of problem:

While creating a new tag. User selecting a tag category from the drop-down should also be able to insert the input text. Instead of scrolling down and selecting from the long list would be very much convenient for user to enter the text and matching string gets filtered.

Also, Why isn't it possible to select multiple tag category and assign same tag to them ?

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

upstream

How reproducible:

Steps to Reproduce:
1. Create New Tag
2. Tag Category field >> Select tag category
3. Input text is missing 

Additional info: Screenshot attached below