repro: adding node to <style> clears injected styles

[billyvg]

Here is a repro of a case where a mutation that adds a node to a <style> (at least I think this is what parentId=-2 is) will clear the previously injected styles. This ends up clearing the noscript css so that the contents of the noscript elements will be displayed in the replay.

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[eoghanmurray]

parentId === -2 means the parent node is ignored in terms of slimDom settings.

There is parentId: -1 in this test case which shouldn't happen I believe (if that is possible we should add a record-time test too)

I haven't tried to recreate yet..