My app Virtual Tags is available for free on the App Store, so you may check by yourself. Actually I am not aware on any configuration that would constrain the editing of text in that way, imagine having done it by error! As said I copied the text into another test app and everything went seamlessly. Unfortunately I could not insert the same code into my App as it gave constraint errors. Also now I cannot make any more tests as the app went totally black, as you may check from another posting of mine.