[morsch]

Any movement key will do the trick. I usually use cursor-right or the end key.

It's so ingrained I had to actually do it in a shell to know what it was I did.

[danielweber]

ISTR pressing one of those keys would obliterate the part of my line where I was writing, putting in ^B characters.

I can't replicate it now on my test box; it works exactly the way you say it should. It may be a terminal issue; I'm currently on Windows using cygwin to ssh to Linux.