Merge branch 'cy/zsh-completion-SP-in-path'

With zsh, "git cmd path<TAB>" was completed to "git cmd path name" when the completed path has a special character like SP in it, without any attempt to keep "path name" a single filename. This has been fixed to complete it to "git cmd path\ name" just like Bash completion does. * cy/zsh-completion-SP-in-path: completion: treat results of git ls-tree as file paths zsh: complete unquoted paths with spaces correctly