How to reproduce:
1. Open the attached project
2. Have any animation control opened (does not matter which)
3. Enter some text to search field
4. Add a new parameter

Actual result: One cannot see the parameter because of the search filter expression and one cannot delete the search filter expression because the parameter text field for setting the name has the focus.
Expected result: Interaction is not blocked

Reproducible: 5.3.6p8, 5.4.2p3, 5.5.0b10, 5.6.0a1