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prxnvt
2b33fcf881
A command that opened an undo group and then returned an error (a `?` between `group_begin` and `group_end`) left the group open for good: Undo and Redo refused with "finish or stop the running action first", later edits made no undo steps, and nothing could stop the group. `execute` now rolls back every group a failed command opened, as `group_rollback` does, restoring the workbook, selection, undo and redo history to where each group began. Only a command that succeeds keeps a group it opened, which is what a debugger's start needs. `Session::abort_groups(doc)` and the menu-less command `automate.stopAction` roll back the groups left open on a document, for a debugger the person abandons or a caller that dropped its token. The command is not undoable and works while a group is open, and the Undo refusal now names it.