Re: [whatwg/dom] Atomic move operation for element reparenting & reordering (Issue #1255)

@tsutsu yes, I faced this issue when using the `moveBefore()` method to improve the `hx-preserve` attribute in htmx.

My solution was to create a hidden "pantry" div that was connected to the main document, move all the preserved elements to that pantry element with `moveBefore()`, merge in the nodes created against a DocumentFragment, then swap the preserved elements into the new content with another `moveBefore()`.

This prevents the preserved elements from ever becoming disconnected and losing their state.  Maybe not the most elegant approach, but it works!

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