refactor(scroll): remove KeepAlive mode and simplify restore logic #306

Job	Run time
build (windows-latest, aarch64-pc-windows-msvc)	8m 3s
build (windows-latest, x86_64-pc-windows-msvc)	8m 1s
build (ubuntu-22.04, x86_64-unknown-linux-gnu)	5m 39s
build (ubuntu-22.04-arm, aarch64-unknown-linux-gnu)	6m 44s
	28m 27s

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