Add unit test for single-member multipolygon collapse behavior in actionJoin (re: f7d8c51bd3b61b2964422973acf9c077f4d7164a)
Add unit test for single-member multipolygon collapse behavior in actionJoin (re: f7d8c51bd3b61b2964422973acf9c077f4d7164a)

kartta-labs/iD,kartta-labs/iD,morray/iD,openstreetmap/iD,openstreetmap/iD,morray/iD,kartta-labs/iD,openstreetmap/iD