JabRef version

Latest development branch build (please note build date below)

Operating system

GNU / Linux

Details on version and operating system

Arch

Checked with the latest development build (copy version output from About dialog)

• I made a backup of my libraries before testing the latest development version.
• I have tested the latest development version and the problem persists

Steps to reproduce the behaviour

1. Open "Clean up" dialog
2. Find a key for a field formatter, e.g. "Title"
3. Start typing "T" then "i"

The items in combobox are not filtered

Appendix

No response