Properly handle <!--break--> HTML comment

I am leaning towards #1 as well. Should be documented though.

Just looking at the CKEditor options, and there doesn't seem to be an option to insert a <!--break-->, at least in the default button set. I think the preferred option nowadays is to use the summary field. So option 1 sounds the preferred choice to me.

Agree it should be documented.

Option 2 is my preferred choice, especially while core is supporting <!--break-->.

I doubt it would take much work to create a CKEditor option to insert <!--break--> (but that is beyond the scope of this issue/module).

MR on its way...

• Set correct version
• Created merge requests
• Added Needs Tests tag
• Set status to Needs Work