Persisting text align does not work out of the box

[peterkraume]

When you use the justify.js plugin to align text centered or right, the change is shown in the editor but it's not persisted upon saving the record.

For that to work, RTE processing needs to be adjusted:

Configuration/RTE/Full.yaml

imports:
  - { resource: 'EXT:typo3_tiptap/Configuration/RTE/Processing.yaml' }

Configuration/RTE/Processing.yaml

processing:
  allowAttributes:
    - style
  HTMLparser_db:
    allowedAttribs: style

I'm currently not sure if this settings should be shipped by default or just documented somewhere because it would allow the style attribute on arbitrary HTML tags.