Unable to save after previewing

[Senne]

Clicking “Preview” in an article opens the preview in a new tab, but it also disables the "Save changes” button, which makes it impossible to save the article after approving the preview.

[bobvandevijver]

Thank you for the report! Would you be willing to create a PR? This is probably caused by #3704, so possibly a simple exclusion for the preview button is all that is needed.