Markers directly in document fragment are always downcast to element

[scofalik]

📝 Provide a description of the improvement

This is a follow-up to #9460.

After markers downcast is enabled in a document fragment, there is one problem with it. When using markerToData, the marker is always downcast to element, instead of an attribute. This is because everything (including text) is enabled inside a document fragment. markerToData relies on schema check and whether $text is allowed at given position to decide whether element or attribute should used.

As a result, we get following conversion:

<marker-start name="foo"></marker-start><p>Abc</p><marker-end name="foo"></marker-end>

Instead of:

<p data-marker-start-before="foo" data-marker-end-after="foo">Abc</p>

Which is different if the same content would be inside a $root. OTOH, we need to have text allowed inside a document fragment. This makes the change difficult, we need to decide if we want to change the logic behind placing attributes instead of elements for markers.

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