Steps to reproduce:
1. Create a new project
2. Install ShaderGraph through the Package Manager
3. Create a new ShaderGraph and open it
4. Once the graph is open, press "Space" on the keyboard to open the node creation menu
5. Start typing in "Gradient"
5. Press "Enter" key on the keyboard to select the highlighted node

Expected result: The node that was highlighted is created
Actual result: Nothing happens, key inputs are going to the search text field

Reproducible with: ShaderGraph 8.1.0 (2020.2.0a17), 10.8.1 (2020.3.27f1), 13.1.4 (2022.1.0b4), 14.0.0 (2022.2.0a3)
Not reproducible with: ShaderGraph 7.7.1 (2019.4.34f1), 8.0.1 (2020.1.0b1) (Different selection menu, but all keyboard inputs are intuitive and go to the selection menu), 12.1.4 (2021.2.10f1)

Notes:
- Tested with macOS
- This affects not only enter, but the whole navigation, like going through the list with up/down arrow keys
- Keyboard navigation works if the list is focused by selecting any element in it with a mouse click