fix Heading.insertNewAfter

[GermanJablo]

• The second parameter of replace had to be true, not restoreSelection which has nothing to do with it.
• I had to add a select, because otherwise when trying to paste a heading at the beginning of a heading an error would appear. This shouldn't be like this, maybe it's a bug in replace.
• Inserting a heading at the beginning of a heading does not combine them as part of the same block. I don't think it's the best behavior. I tried to fix it but insertNodes is still tremendously complex despite recent improvements.

[vercel]

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[zurfyx]

Thank you, let's merge this for now! But yeah, something's still off

In here I'm pasting

<meta charset='utf-8'><h1 class="x1603h9y x117nqv4 x1u7k74 xi48ejl x1xmf6yo x1e56ztr" dir="ltr"><span style="white-space: pre-wrap;">Welcome to the playground</span></h1>

Screen.Recording.2023-11-03.at.9.00.38.AM.mov

For GDoc it doesn't even recognize it as a heading