If you don't go the long way with undo and redo you could store the 'original' content and sit and wait for the GADGET_ACTION event (A GADGET_ACTION event occurs whenever the user modified a TextArea's text. ). If the event occurred you can act directly on that one or may set a flag to remember that the text could be different than the original, which can be checked with your original one.
Detect a "change" inside a textarea?
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