Add support for controlling the behaviour of document-proxy icons #1981

Job	Run time
test-unstable	15m 50s
install-flake-against-unstable	6m 13s
install-flake-against-stable	3m 10s
install-against-stable	5m 46s
test-stable	20m 23s
install-against-unstable	18m 35s
	1h 9m 57s

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