Re: [PATCH/RFC] filter-branch: Fix to allow replacing submodules with another content

> When git filter-branch is used to replace a submodule with another
> content, it always fails on the first commit. Consider a repository with
> directory submodule containing a submodule. If I want to remove the
> submodule and replace it with a file, the following command fails.
> 
> git filter-branch --tree-filter 'rm -rf submodule &&
> 				 git rm -q submodule &&
> 				 mkdir submodule &&
> 				 touch submodule/file'
> 
> The error message is:
> error: submodule: is a directory - add files inside instead
> 
> The reason is that git diff-index, which generates a part of the list of
> files to update-index, emits also the removed submodule even if it was
> replaced by a real directory.
> 
> Adding --ignored-submodules solves the problem for me and
> tests in t7003-filter-branch.sh passes correctly.