:any:`notmuch-show`, :any:`notmuch-search`, :any:`notmuch-tree`, and
:any:`notmuch-unthreaded` mode) keeps a local stack of tagging
operations. These can be undone via :any:`notmuch-tag-undo`. By default
:any:`notmuch-show`, :any:`notmuch-search`, :any:`notmuch-tree`, and
:any:`notmuch-unthreaded` mode) keeps a local stack of tagging
operations. These can be undone via :any:`notmuch-tag-undo`. By default