No undo or redo available

The selected author has no eligible transaction on the requested undo or redo stack. No transaction is created and documents are unchanged.

#Common causes

• That author has made no undoable edit, or all eligible edits have already been undone.
• Redo was requested without an eligible preceding undo.

#Fixes

• Check ara history --by <author> and the CLI's --author or ARA_AUTHOR setting.

• If there is no eligible change, nothing needs fixing; use ara undo <txn> only when a specific retained transaction is the intended target.

• Code: ARA1505

• Constant: NOTHING_TO_UNDO

• Reported by: ara-ops