Merge branch 'ds/add-rm-with-sparse-index'

"git add", "git mv", and "git rm" have been adjusted to avoid updating paths outside of the sparse-checkout definition unless the user specifies a "--sparse" option. * ds/add-rm-with-sparse-index: advice: update message to suggest '--sparse' mv: refuse to move sparse paths rm: skip sparse paths with missing SKIP_WORKTREE rm: add --sparse option add: update --renormalize to skip sparse paths add: update --chmod to skip sparse paths add: implement the --sparse option add: skip tracked paths outside sparse-checkout cone add: fail when adding an untracked sparse file dir: fix pattern matching on dirs dir: select directories correctly t1092: behavior for adding sparse files t3705: test that 'sparse_entry' is unstaged