I have a submodule which I don't control and want to ignore. I can use git update-index --assume-unchanged on the submodule or edit the .gitmodules and add ignore=dirty and use --assume-unchanged on that to essentially keep this folder deleted. this works fine until I branch my code. When I do that sourcetree automatically does a full checkout recursive on this submodule so it pulls it down polluting my repo. Could we add a flag to not do this?