can't move cursor back or delete characters once a string has been added #51
Description
I am trying to write an ncurses tcp chat client using this library however I have been unable to find a way to implement the backspace function in the form window. Once a string has been typed there is no way to .move the cursor back. I have looked in the examples but the irc client and InputBox widget also seem to share this lack of functionality. You can type to create characters in the window but backspace does nothing.