@bender-tags: 4.17.2, bug, 4934
@bender-ui: collapsed
@bender-ckeditor-plugins: wysiwygarea, toolbar, image

1. Set the High Contrast Mode.
2. Open image dialog.
3. Using the `TAB` key on on the keyboard, change the focus to the dialog tab title.

**Expected**

The title of the dialog tab should be underlined.

**Unexpected**

The title of the dialog tab has not changed.
