- Open the insert-link dialog.
- Enter https://example.org/?a=b|c as the 'Target page or URL'.
- Note that it displays an 'invalid title' message.
- Select the 'To an external web page' radio button.
- The invalid message should disappear, and the insert button be enabled, but neither happens and it's not possible to insert the link.
It works correctly if the external radio button is selected before the title is entered, and also if the dialog is closed and then opened again.