Method undo

texteditor/editor.go:442–457

Undo / Redo undo undoes previous action

()

// undo undoes previous action
func (ed *Editor) undo() {
	tbes := ed.Buffer.undo()
	if tbes != nil {
		tbe := tbes[len(tbes)-1]
		if tbe.Delete { // now an insert
			ed.SetCursorShow(tbe.Reg.End)
		} else {
			ed.SetCursorShow(tbe.Reg.Start)
		}
	} else {
		ed.cursorMovedEvent() // updates status..
		ed.scrollCursorToCenterIfHidden()
	}
	ed.savePosHistory(ed.CursorPos)
	ed.NeedsRender()
}

// redo redoes previously undone action
func (ed *Editor) redo() {