Add primary-selection filter #4892

Job	Run time
smithay-check-features	2m 54s
format	15s
clippy-check	4m 23s
smallvil-check	50s
smithay-tests	2m 30s
anvil-check-features	2m 31s
check-minimal	1m 6s
check-msrv	1m 8s
Documentation on Github Pages	2m 15s
WLCS: Core tests	1m 25s
WLCS: Output tests	1m 13s
WLCS: Pointer input tests	1m 19s
WLCS: Bad Buffer Test	1m 9s
	22m 58s

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