The optimization to prevent downloading of ignored files broke
unshelving[1]. A shelveset is treated as a changeset by git-tfs, but there
is no changeset version for it, so you can't ask the workspace to get a
shelveset by version, instead the shelveset itself needs to be responsible
for populating the workspace with the correct files[2].
[1] 351ed3d69f
[2] 26fe4ad269
Kim Gybels
29fabab81c