Error with FieldDropdown

[NeuralCoder3]

In the file value_block.js the variable args[j][1] is cloned when it is a Blockly.FieldDropdown.
In my tests args[j][1].clone(); always retuned the error Uncaught TypeError: args[j][1].clone is not a function
Any attempts to clone it manually or via Json didn't worked.

In the android version there is a clone function which is missing in the javascript version. To bypass this a new object can be generated with the constructor var dd=new Blockly.FieldDropdown(args[j][1].menuGenerator_,args[j][1].changeHandler_);.