I have a sorted custom window where i regularly do /aline and /rline.
For some reason though, a linefeed was suddenly missing. It wasn't visible in the window, but only shows when I copied the data, also $line() showed the 2 merged lines as 1.
So i guess only internally the linefeed was gone.
Sadly I'm not able to reproduce this bug, also it happened on mIRC 6.32.