Write some text in the `Text to be encoded` text box.
That text is encoded as Ascii whitespace characters and placed in the `Encoded text` text box.
Whatever goes into the 'Encoded text' is automatically decoded into the `Decoded text` box.
The 'Encoded text' box may look empty. It isn't.
Copy `Encoded text` using the `Copy to Clipboard` button.
Change the text in the `Text to be encoded` box.
Paste the clipboard using the `Paste` button, and the `Decoded text`
should change to reflect the new value in the `Encoded text` box.