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Using a library's character or paragraph style, and scrubbing a numeric field, closed their undo step with Session::end_undo_group, which closes the open undo group of every document. An undo group open in another document, such as one begun with edit.undoGroup.begin for an MCP command_batch with atomic, was closed too, and that document's next edits became undo steps of their own. When the style failed to apply, or Escape ended the scrub, the other document's group was canceled as well and the edits made in it were undone. Inside an undo group already open in the same document, a scrub closed that group, Escape undid the edits made in it before the drag, and a style that failed to apply left the style it had added. Session::begin_undo_scope and end_undo_scope make the edits in between one undo step of the active document: the scope opens an undo group there, or joins the one already open. Ending a scope closes only the group it opened, in its own document, even when another document became active in the meantime, and a canceled scope undoes only its own edits, also inside a group that was already open. library.use and the scrub use the scope, so Escape inside an open group also takes back a scrub of the Transform panel's Shear field. edit.undoGroup.end still closes the open group of every document.