Incorrect focus handling on the link dialog

[Teresa Monahan]

To Reproduce:

• Open any CKEditor sample and clear the contents of the editor.
• Open the Link dialog and select 'Link to anchor in the text' as the Link Type. As there are no anchors in the editor, the '(No anchors available in the document)' message is displayed.
• Press Tab.

Expected Result: Focus goes to div containing the '(No anchors available in the document)' message and JAWS reads this to the user.

Actual Result: Focus goes to Window and JAWS reads the window title.

When you press tab again focus goes to the OK button. Then when you press Shift + Tab, focus returns to the window. If you continue to press Shift + Tab, focus moves back & forth between the window and the OK Button and never goes to other fields in the dialog.

This is a 4.x issue. It does not occur in 3.x.

[Jakub Ś]

DUP of #9845.