git-svn: problem with svn cp trunk/subdir tags/subdir_1.0

After fixing --preserve-empty-dirs plus --stdlayout a new problem arised: When creating a tag or branch from a subdir, a disjoint branch is created. Then git-svn re-imports the commits using this dir as strip path.

Why? I would instead keep the current commit as parent, delete everything except the subdir and move its contents to root directory.

During this re-import the variable %added_placeholder is not up to date. Because the branch is disjoint, this variable should be empty in the beginning, but it's not. Because of that git-svn tries to delete non-existent .gitignore files and dies.

I think, if a disjoint branch is created, %added_placeholder should be pushed and cleared. A new set of paths starting with "trunk/" will be added to it during re-import. When re-import is done, we should translate the paths to "tags/subdir_1.0/" and merge with the original %added_placeholder.