Make water behave in less odd ways

[mugg91]

Current in-game behaviour.

Sometimes water looks odd after using sponge. For example, what looks like water is coming out of dirt - a waterfall - will look like a body of water floating in the air. It also sometimes looks odd that water spreads all over the map when it should just be falling down into the void.

Suggestion

Add a water source tile that cannot be drained where water will always come out.

Example:

A sponge has been used on the left side, which looks odd because it looks like water coming out of thin air.
The topmost water tiles should be "water source tiles" where water will continue to come out and that cannot be drained.

---

Make water not spread sideways if there is no ground somewhere below the water tile.

Example:

When placing the stone tile there, water would spread to the left. Since it falls down into the void, it should not spread to the left.