Merge branch 'sy/mv-out-of-cone'

"git mv A B" in a sparsely populated working tree can be asked to move a path from a directory that is "in cone" to another directory that is "out of cone". Handling of such a case has been improved. * sy/mv-out-of-cone: builtin/mv.c: fix possible segfault in add_slash() mv: check overwrite for in-to-out move advice.h: add advise_on_moving_dirty_path() mv: cleanup empty WORKING_DIRECTORY mv: from in-cone to out-of-cone mv: remove BOTH from enum update_mode mv: check if <destination> is a SKIP_WORKTREE_DIR mv: free the with_slash in check_dir_in_index() mv: rename check_dir_in_index() to empty_dir_has_sparse_contents() t7002: add tests for moving from in-cone to out-of-cone