How to reproduce:
1. Create a new Unity project and install the Visual Effect Graph package
2. In the Project window, right-click -> Create -> Visual Effects -> Visual Effects Graph
3. In the "Create new VFX Asset" window, use the arrow keys to move to any category
4. Observe the focused category (Symptom A)
5. With the category focused, press Enter or Space (Symptom B)
Expected results:
A. The focused category is visually highlighted
B. Pressing Enter/Space expands/collapses the focused category
Actual results:
A. There is no visual highlight on the focused category
B. The category is not expanded/collapsed when pressing Enter/Space
Reproducible with: 6000.0.74f1, 6000.3.14f1, 6000.4.6f1, 6000.5.0b7, 6000.6.0a4
Reproducible on: macOS Tahoe 26 (M1)
Not reproducible on: No other environment tested
Note: The section can be expanded by pressing "Tab" and then "Space", which moves
keyboard focus into the list before the Space key is handled. This workaround is
not intuitive and suggests the category list is not the actual keyboard focus
target while arrow-navigating.