NB : 6.5.1 and 6.7 trunk.
It seems that underline and selection for line on output window are not
displayed properly when multibyte characters are included.
I'll attach the screenshot. I tried SQL execution,
1. error on Output window, it seems that underline is not correct
2. click on the line, selection looks good
3. turn wrap line on, selection is now shrunk.
Created attachment 81606 [details]
The same problem as issue 164355
*** This issue has been marked as a duplicate of 164355 ***