When you rebase a branch and there are conflicts, lazygit asks you to continue
the rebase when it detects that all conflicts have been resolved. However, it is
common to make additional changes beyond just fixing the conflicts (e.g. to fix
build failures), and when doing that while the "Continue the rebase?" prompt is
showing, lazygit detects that too and asks you if you want to stage those newly
modified files too. This is all well and good (and can be disabled for those who
don't like it); however, lazygit would treat out-of-date submodules as unstaged
changes and would offer to stage those as well, and this is pretty bad and
almost never what you want. Fix this by excluding submodules from that second
check.