Repeating same message search term fails

• gajim nightly flatpak

I believe this started with ecc80631.

Steps to reproduce

1. press ctrl+f
2. type 'test', press enter
3. press escape key to close search
4. press ctrl+f
5. type 'test', press enter

What happens

The second search produces no output. To search the same term again, you must search a different term, then do the original again.