originally reported https://bugs.funtoo.org/browse/FL-5000

Tested on two nearly identical funtoo / kde-kit/5.12 machines, tried also with wallet subsystem both enabled and disabled, it made no difference.

To reproduce:
1. import secret key via kgpg
2. double click on the newly imported key, set the trusted level to ultimate and click apply or ok.
3. the program will hang and use high cpu until kde crashes if you don't kill the process.

Workaround kgpg limitation:
The command line still works!

gpg --import private.key

Given the KEYID (e.g FA0339620046E260) from the output:

gpg --edit-key
{KEY}

trust quit

    enter 5<RETURN>
    enter y<RETURN>