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Now that "git worktree add" has achieved user-facing feature-parity with "git checkout --to", retire the latter. Move the actual linked worktree creation functionality, prepare_linked_checkout() and its helpers, verbatim from checkout.c to worktree.c. This effectively reverts changes to checkout.c by 529fef20 (checkout: support checking out into a new working directory, 2014-11-30) with the exception of merge_working_tree() and switch_branches() which still require specialized knowledge that a the checkout is occurring in a newly-created linked worktree (signaled to them by the private GIT_CHECKOUT_NEW_WORKTREE environment variable). Signed-off-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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