Simple Undo
From TED Notepad
Simple Undo (Alt+BkSpace)
Performs Undo or Redo, depending on whether there is something to Redo.
Note: This can be used to emulate a simple single-level Undo command known from older version of TED Notepad.
Note: Unlimited multi-level undo queue can be turned off completely by Suppress multi-level Undo/Redo setting in the Settings dialog. See chapter Edit page of the Settings dialog.