Maintain elements in head/body during hydration #5392

Job	Run time
Filter jobs	5s
Compressed Size / build	1m 1s
Build & Test / Build & Test	1m 37s
Benchmarks / Prepare environment	9s
Benchmarks / Bench todo / Bench todo/todo	1m 49s
Benchmarks / Bench 03_update10th1k_x16 / Bench table-app/update10th1k	1m 23s
Benchmarks / Bench replace1k / Bench table-app/replace1k	2m 53s
Benchmarks / Bench filter-list / Bench filter-list/filter-list	1m 35s
Benchmarks / Bench text-update / Bench text-update/text-update	1m 25s
Benchmarks / Bench hydrate1k / Bench table-app/hydrate1k	3m 19s
Benchmarks / Bench create10k / Bench table-app/create10k	2m 26s
Benchmarks / Bench many-updates / Bench many-updates/many-updates	1m 56s
	19m 38s

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