Support for Workspaces

The attached patch to Drupal core gets Mercury Editor loading with workspaces.

Below shows how navigation and workspaces look within mercury editor.

Patch #2 doesn't apply to 2.2.0-RC1 with D11.1

Yeh that patch is to core because Mercury Editor is extending HtmlEntityFormController and Workspaces does not support returning a RedirectResponse.

Linking this to https://www.drupal.org/project/layout_paragraphs/issues/3472181 ✨ Make Layout Paragraphs Workspaces compatible Active , as Layout Paragraphs is where we should build in the base compatibility with Workspaces.