[WIP] Fix extra newlines added to text when loading iframe

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>Loading the iFrame adds extra newlines to the text</issue_title>
<issue_description>I host an etherpad server and use etherpad.js to put etherpad iframes into my website. Unfortunately, every time an iframe is loaded, the newlines (\n) get modified (generally, they increase in number). This doesn't happen if I just reload the pad on my server, so it seems to have something to do with the iframe, but I don't know what.

Do you have any idea about how this could be happening?</issue_description>

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