Remove collision from water

tests/item_entity_test.ts

@@ -114,3 +114,16 @@ Deno.test("q throws one of an item the way the player looks, ctrl throws the who
 	send(1, { type: "drop_item", container: "crafting", index: 9, all: true });
 	assertEquals(game.item_entities().length, 2);
 });
+
+Deno.test("water has no collision, items sink through it to the floor", async () => {
+	const { game, join } = await test_game("mods");
+	join(1, "alice");
+	build_floor(game);
+	for (let y = 100; y <= 102; y++) {
+		game.set_block(6, y, 0, "bworld:water");
+	}
+	const item = game.spawn_item(6.5, 104, 0.5, new ItemStack("bworld:dirt"));
+	for (let i = 0; i < 40; i++) game.tick();
+	assert(item.on_ground);
+	assertEquals(item.y, 100, "on the stone under the water");
+});