Re: mouse-face redisplay messy on Windows XP x64 Edition

[Richard Stallman]

    I think it's really a bug, but it's difficult to fix: basically CR in comint
    currently erases line and puts point at BOL, but it should only put point at
    BOL (and then overwrite the line when subsequent output comes).
    Problem is that comint's normal behavior is not to overwrite text but to
    insert it, so it's not trivial to change.  Maybe we could try to special
    case the situation where CR is immediately followed by LF?

Right.  Since comint-output-filter always does the insertion, it won't
have trouble checking the flag each time, and you won't need to change
much code.