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bdb866ea76
We weren't copying these lists, so the += was actually changing the underlying lists. When a new project was added to the manifest, we run _CheckDirReference against the manifest project with share_refs=True, which added the working_tree_* to the shareable_* lists. Then, when we load the new manifest and create the new project, it uses the lists that already contain the working_tree_* files, even though we passed share_refs=False. This happens reliably under the above conditions, but doesn't seem to happen when syncing a fresh tree. So we've got a mixture of links that may need to be cleaned up later. This patch will just stop it from happening in the future. Change-Id: Ib7935bfad78af1e494a75e55134ec829f13c2a41