Merge branch 'tb/complete-checkout' into maint

Command line completion (in contrib/) update.

* tb/complete-checkout:
  completion: add remaining flags to checkout

contrib/completion/git-completion.bash

@@ -1250,7 +1250,8 @@ _git_checkout ()
 	--*)
 		__gitcomp "
 			--quiet --ours --theirs --track --no-track --merge
-			--conflict= --orphan --patch
+			--conflict= --orphan --patch --detach --ignore-skip-worktree-bits
+			--recurse-submodules --no-recurse-submodules
 			"
 		;;
 	*)

t/t9902-completion.sh

@@ -1245,6 +1245,10 @@ test_expect_success 'double dash "git checkout"' '
 	--conflict=
 	--orphan Z
 	--patch Z
+	--detach Z
+	--ignore-skip-worktree-bits Z
+	--recurse-submodules Z
+	--no-recurse-submodules Z
 	EOF
 '