Go to a form, enter some values, and submit the form. Allow the values to be written into the wallet. Go to wallet editor (edit/wallet/wallet-contents). You will see the values you just saved. Using the editor, delete one of the values. Click on OK. Return to the wallet editor a second time. The deleted values are still there.
Fixed. Just checked in a new version of WalletEditor.html.
verified. deletions are persistent - on relaunches also