Fix flickering when sorting sections after returning to the outline #1657

Job	Run time
trigger-edge-build	0s
jest (pageflow, package)	2m 2s
rspec (pageflow, 3.2, ., bin/rspec --tag ~js, true)	6m 1s
jest (pageflow-paged, entry_types/paged/packages/pageflow-paged)	1m 49s
rspec (pageflow, 3.2, ., bin/rspec-with-retry --tag js)	4m 52s
jest (pageflow-paged-react, entry_types/paged/packages/pageflow-paged-react)	1m 48s
rspec (pageflow_paged, 3.2, entry_types/paged, pageflow_paged, bin/rspec)	3m 51s
jest (pageflow-scrolled, entry_types/scrolled/package)	2m 28s
rspec (pageflow_scrolled, 3.2, entry_types/scrolled, pageflow_scrolled, bin/rspec --tag ~js)	4m 34s
rspec (pageflow_scrolled, 3.2, entry_types/scrolled, pageflow_scrolled, bin/rspec-with-retry-on-t...	4m 14s
	31m 39s

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