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A rollback reverts whole undo groups, across files and saves, so that no user action is left half done. Some actions still split: - An action that commits several times inside one undo transaction (e.g. applying a token to several shapes) gave each commit its own group, so a rejection could revert part of it: shapes ended up linked to a token whose value was never applied. An undo transaction now opens with a commit group that every commit made inside it takes. - The commit that undoes saved commits of a rejected action joined an open transaction's group, so a later rejection there reverted the undo too. It gets a group of its own. - Emptying the open transaction during a rollback dropped its group, so its later commits were no longer one unit. It keeps its group. - Waiting for a save ended as soon as the queue emptied, while later commits could still wait in the buffer. Waiters now also wait for an empty buffer. A test covers a token action of three commits in one save whose third commit is rejected.