Hi all,

Today I was trying to run fzf[1] in term when I ran into a weird issue
that will cause the term output to be clobbered with certain output. The
root cause seems to be a double counting in the column offset. This is
usually fine, unless `2*len(inserted text)' causes the point to be equal
to the window width. I fixed the issue and added a new test in the
attached patch

[1] https://github.com/junegunn/fzf