Function NeighbourIsNormal

src/clear_cmd.cpp:223–232

* Tests if at least one surrounding tile is non-desert * @param tile tile to check * @return does this tile have at least one non-desert tile around? */

 * @return does this tile have at least one non-desert tile around?
 */
static inline bool NeighbourIsNormal(TileIndex tile)
{
	for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
		TileIndex t = tile + TileOffsByDiagDir(dir);
		if (!IsValidTile(t)) continue;
		if (GetTropicZone(t) != TROPICZONE_DESERT) return true;
		if (HasTileWaterClass(t) && GetWaterClass(t) == WaterClass::Sea) return true;
	}
	return false;
}

static void TileLoopClearDesert(TileIndex tile)
{