Sent you an email but I put it also here for others to see:

- I open /home/saku/.local/share/WSJT-X/wsjtx_log.adi with plain text editor
- scroll to the end of the file. The last qso is there.
- paint whole last line beginning with <call and ending to <eor> with mouse (3 clicks over the line makes it easy)
- press Ctrl+C to copy the painted line
- open new empty text file to editor (file-> new)
- type something like "start" to first line. Text does not matter.
- type <eor> to second line (end of header tag: 5 characters)
- 3rd line press Ctrl+V to paste the copied qso line still in clipboard
- save the new file from editor with some name using ".adi" extension like: /tmp/hi.adi
- open QSO_list/File/Import/ADIF and find the saved file /tmp/hi.adi and open it
- press the "import" button and job is done

Important thing is that if you pick one line from wsjtx_log.adi and put it to separate file you have to do the header to that file.
It is even enough to press enter once and then write <eor> to next line.
Because is what Cqrlog's ADIF import is looking first to start the import operation.

So far this method has always worked for me.