Show the IP address, if available, in the comment edit screen submit meta box. props leewillis77. fixes #24638.

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Consistently wrap `author` and `excerpt` nodes with `CDATA` in feeds.

Fixes #18056.


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Ignore user ID post data.

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Tighten allowed upload file types.

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Validate referrers to prevent off-domain redirects.

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Better protocol validation in set_url_scheme().

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Loose validation for is_serialized() in maybe_serialize().

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