Build

backgrounds: Improve wayland session support. #2720

Job	Run time
generate-test-packages	-1s
build / build (lmde7, linuxmintd/lmde7-amd64, LMDE 7, false) / LMDE 7	3m 38s
build / build (mint22, linuxmintd/mint22.3-amd64, Mint 22, true) / Mint 22	3m 10s
	6m 47s

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