Improvement for compliance and GDPR: Storage of form data submitted through the form block is now optional. It is a new checkbox in the block (thanks Faker Ben Ali)
Behavioral Improvements
Much improved performance in the Stacks panel menu for sites with a lot of stacks – stacks lazily load the blocks within them.
Dashboard Welcome Page: hides the "Customize" button if the user does not have permission to edit the page content (thanks marvinde)
Allow disabling of Sitemap button in CKEditor concrete5link core plugin (thanks joemeyer)
Fixed W3C validation errors in Elemental (thanks MPagel)
Bug Fixes
Fix XSS error when certain error messages could contain HTML (thanks mlocati)
Fix error where EditorServiceProvider was complaining about array_merge not being a valid array
Fixed: GDPR - ConversationMessages are not deleted when a user is deleted (thanks marvinde)
Fix typo in list of CKEditor plugins ('applying') (thanks a3020)