[0.18.0] Fish prevent water tiles from being filled in in editor

[knightelite]

As can be seen in this video, filling in water tiles in the editor mode in 0.18.0 when fish are present results in the water not being filled in. This is annoying, and fish should be auto-removed in this situation.

I've attached my save, though this should occur in any savegame.

[boskid]

Not a bug

Turn off "Smart entity collision mode" in editor if you want different behavior

[knightelite]

Thanks.