RasterLayer: Properly handle GUI updates when multiple canvas are displayed #34855

Job	Run time
build (22.04, 5, true, OFF, ON, ON, ON, ON, OFF, OFF, OFF, OFF, ON, false)	42m 15s
build (39, 6, true, ON, OFF, ON, ON, OFF, OFF, ON, ON, ON, OFF, false)	1h 11m 35s
clang-tidy (22.04, 5)	11m 5s
Run tests (5, ALL_BUT_PROVIDERS)	30m 8s
Run tests (5, POSTGRES)	6m 8s
Run tests (5, HANA)	5m 27s
Run tests (6, ALL_BUT_PROVIDERS)	36m 40s
Run tests (5, ORACLE, 22.04, binary-for-oracle)	6m 15s
	3h 29m 33s

Provide feedback