The current implementation of `create_fragment` (and the underlying `create_fragment_at_current_node`) allows passing in a context that might result in a tree that cannot be represented by HTML. For example, a user might use `<p>` as context, and attempt to create a fragment that also consists of a paragraph element, `<p>like this`. This would result in a paragraph node nested inside another -- something that can never result from parsing HTML.
To prevent this, this changeset makes `create_fragment_at_current_node` private and limits `create_fragment` to only `<body>` as context, while a comprehensive solution to allow other contexts is being worked on.
Follow-up to [59444], [59467].
Props jonsurrell, dmsnell, bernhard-reiter.
Fixes#62584.
Built from https://develop.svn.wordpress.org/trunk@59469
git-svn-id: http://core.svn.wordpress.org/trunk@58855 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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