Introduce method to easily "clone" element with children to model writer.

[jodator]

📝 Provide a description of the new feature

In some copy/paste scenarios there's a need to copy elements along with its attributes and with children.

I'd propose a new method:

writer.copyElement( element ); // Copies this element with its attributes.
writer.copyElement( element, { deep: true } ); // As above but with children.

That will create a shallow or deep copy of given element. The rationale behind object is that this might be later on enhanced and also simple true/false is hard to remember in code.

ps.: ATM we have private Element._clone() but this is not a good way of doing this.

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[scofalik]

I think that cloneElement will be a better name - I'd guess people are more used to "cloning".

[Reinmar]

Agree – cloneElement() sounds more "common".

[jodator]

AFAIR it should also land on model isntance. Let's follow createElement() pattern here - so only on writer.