Singleton Paragraphs in Tables Removed

[mmichaelis]

Describe the bug

If there is just one paragraph within a table data cell <td>, it is removed within CKEditor processing, which reflects this architectural decision:

The table feature allows for creating block content (like paragraphs, lists, headings, etc.) inside table cells. However, if a table cell contains just one paragraph and this paragraph has no special attributes (like text alignment), the cell content is considered “inline” and the paragraph is not rendered.

(See Tables - CKEditor 5 Documentation).

While this may be desirable, all CoreMedia RichText created with CKEditor 4 comes with paragraphs (always). Thus: While CoreMedia RichText DTD considers singleton paragraphs as valid just as just plain characters within <td>, processing in CKEditor may remove this <p>. This may cause subtle different results in rendering CoreMedia RichText later on, thus, it is considered a bug.

To Reproduce

Steps to reproduce the behavior:

1. Go to Example App.

2. Set the following data in source editing:

   <?xml version="1.0" encoding="utf-8"?>
   <div xmlns="http://www.coremedia.com/2003/richtext-1.0"><table><tbody><tr><td><p>Lorem</p></td></tr></tbody></table></div>

3. Store Data

4. Reopen source editing.

Expected Behavior

Paragraph should be kept as is (the same: if there is none, no paragraph should be added).

Actual Behavior

Singleton paragraph is always removed according to the requirement stated above.

Possible Workaround

On data-processing add some attribute to the paragraph, so that it isn't removed as being obsolete.

Environment (please complete the following information):

• OS: Windows 10
• Browser: Chrome
• Browser Version: 99.0
• CKEditor Version: 32.0.0
• CoreMedia's CKEditor Plugins Version: 4.0.1