bug#91: using mouse to paste into comint buffer

[Chong Yidong]

> If I try to select some text in a gnome-terminal and then paste it
> into a gud buffer, the actually-pasted text will often end up being
> the command on the previous line, rather than whatever I selected.
>
> This only seems to happen when the prompt line is the very last line
> of the window.  If I recenter first, I can paste my selection -- but
> this is pretty inconvenient and I often forget to do it.

I can't seem to reproduce this.  Nick, can you?