Search Dropdowin in Requirements Tracing field is cut off

[junkerm]

Describe the bug
When trying to add a tracing requirement in the process editor, the search result is cut off.

To Reproduce
Steps to reproduce the behavior:

1. Go to a process model
2. Click on a step node
3. On the Tracing pane on the right search for a requirement with a long name
4. Observe that the search result is cut off (see screenshot)

Screenshots
If applicable, add screenshots to help explain your problem.