This changes mob floating so they stay inside the top water node instead of

standing on it. The head of the mod should still be above water.

Changes drowning so that mobs will not drown in one block of water. They will
drown in 2 or more blocks of water.

Does not appear to affect them getting out of deep water :( But they do seem to
die somewhat faster when they stay in deep water.

mods/ENTITIES/mcl_mobs/physics.lua

@@ -675,6 +675,9 @@ function mob_class:do_env_damage()
 	self.standing_in = node_ok(pos, "air").name
 	self.standing_on = node_ok(pos2, "air").name
 
+	local pos3 = {x=pos.x, y=pos.y+1, z=pos.z}
+	self.standing_under = node_ok(pos3, "air").name
+
 	-- don't fall when on ignore, just stand still
 	if self.standing_in == "ignore" then
 		self.object:set_velocity({x = 0, y = 0, z = 0})
@@ -682,6 +685,7 @@ function mob_class:do_env_damage()
 
 	local nodef = minetest.registered_nodes[self.standing_in]
 	local nodef2 = minetest.registered_nodes[self.standing_on]
+	local nodef3 = minetest.registered_nodes[self.standing_under]
 
 	-- rain
 	if self.rain_damage > 0 then
@@ -761,7 +765,7 @@ function mob_class:do_env_damage()
 			if minetest.get_item_group(self.standing_in, "water") == 0 then
 				drowning = true
 			end
-		elseif nodef.drowning > 0 then
+		elseif nodef.drowning > 0 and nodef3.drowning > 0 then
 			drowning = true
 		end
 
@@ -939,7 +943,7 @@ function mob_class:falling(pos)
 
 	-- in water then float up
 	if registered_node.groups.water then
-		if acc and self.floats == 1 then
+		if acc and self.floats == 1 and minetest.registered_nodes[node_ok(vector.offset(pos,0,self.collisionbox[5],0)).name].groups.water then
 			self.object:set_acceleration(vector.new(0, -self.fall_speed / (math.max(1, v.y) ^ 2), 0))
 		end
 	else