Correctly generate the CSS classes of the `FormSelectMenu` widget (see #7045)
Restore the "submit_container" class in the `FormSubmit` widget (see #7055)
Make the viewport field 255 characters long (see #7050)
Only use the DropZone uploader where Ajax uploads can be processed (see #7046)
Correctly set the default page title (see #6783)
Preload TinyMCE so it can be used in subpalettes (see #7056)
Remove the example website from the core distribution

The example website is now available in the extension repository.
Support adding ACE and TinyMCE in subpalettes (see #7056)