The initial reason in #237 is not valid anymore, as vim-gitgutter
functions as expected for editing files that are not part of a repo,
whether they are:
- in a different repo
- in a parent repo (cwd being a submodule)
- outside of the repo
Furthermore, removing this check allows to show relevant info for
specific fugitive file names that are fugitive://..../sha1//...
which are hard to parse manually, especially in complicated situations
such as submodules.
e415c5301f