/usr/share/vim/addons/ is in vim-addon-mw-utils 0.1-5.
This file is owned by root:root, with mode 0o755.
..
/usr/share/vim/addons/autoload/
/usr/share/vim/addons/autoload/buf_utils.vim
/usr/share/vim/addons/autoload/cached_file_contents.vim
/usr/share/vim/addons/autoload/env_reload.vim
/usr/share/vim/addons/autoload/funcref.vim
/usr/share/vim/addons/autoload/glob.vim
/usr/share/vim/addons/autoload/tiny_cmd.vim
/usr/share/vim/addons/autoload/tovl/
/usr/share/vim/addons/autoload/tovl/scratch_buffer.vim
/usr/share/vim/addons/autoload/tovl/ui/
/usr/share/vim/addons/autoload/tovl/ui/filter_list.vim
/usr/share/vim/addons/doc/
/usr/share/vim/addons/doc/cached_file_contents.txt
/usr/share/vim/addons/doc/funcref.txt
/usr/share/vim/addons/doc/tiny_cmd.txt