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`Session::history_budget` (default `default_history_budget()`) caps the memory the undo steps of all open documents keep together. After each command, tool edit, interaction commit, direct edit, framed script run and closed undo group, `Session::trim_histories` drops the oldest steps of any document first, undo steps before redo steps. Each document keeps its last eight undo steps and next eight redo steps, and a held history keeps all of its steps. While a script runs or an undo group is open, no steps are dropped, so a canceled group leaves the other documents' steps in place. Closing a document frees its share. The steps are not counted again while neither the budget nor any history changed. Each document's own `byte_budget` stays as its ceiling.