TYPO3 Core

I think that these issues are related or even the same:

#83754, #84743, #88710

I am unsure about how to reproduce this issue. May I ask a step-by-step guide? Including the CKeditor yaml configuration that should be used? Thank you!

@Riccardo

I've tested this with Bootstrap Package, reproducing it's pretty simple:

1. Edit any content element that has a ckeditor
2. Mark some text and put a link on it. In the Link Browser, select a CSS class from the selector and finally set the link
3. Edit the link again, the previously selected class is not selected anymore

@Andreas Otto †

I tried with the yaml configuration taken from Bootstap package:

classesAnchor:
    page:
        class: 'link-page'
        type: 'page'
    folder:
        class: 'link-folder'
        type: 'folder'
    file:
        class: 'link-file'
        type: 'file'
    external:
        class: 'link-external'
        type: 'url'
    mail:
        class: 'link-mail'
        type: 'mail'

buttons:
    link:
        properties:
            class:
                allowedClasses: 'link-arrow, link-page, link-folder, link-file, link-external, link-mail'

And actually, the behavior is the one you described. But I think that it is due to the link-arrow class that has no "type" defined. Actually, if you remove it, then the selected class will stay.

That's the same behavior I experienced with my first attempt:

classesAnchor:
  internalLink:
    class: 'internal-link'
    type: 'page'

  internalLink2:
    class: 'internal-link-2'
    type: 'page'    

buttons:
  link:
    properties:
      class:
        allowedClasses: 'internal-link,internal-link-2'

I agree with Riccardo here, configuration error.