Unfortunately placed "CLEAR" button for text box!!

There is a "Clear" button right next to the "Done" button when editing a text box. I was almost done typing a paragraph, when I accidentally "Clear"ed the text box and lost all my work! I had no idea how to undo it, since there is no Shake-to-Undo and the existing undo buttons for annotating do not seem to work. Agh! Should put the "Clear" button somewhere else or eliminate it altogether.

Lenny what eats lettuce about PDF Box