On editing a Bundle product from shopping cart the user defined quantities of the options are overwritten

[densen45]

Steps to reproduce

1. Install Magento CE 2.0.6
2. Create a Bundle product with at least one option of type radio and enable user defined quantity
3. Add more then one product to the option and enable user defined quantity
4. Open the Bundle product on frontend
5. Change the quantity of an option
6. Add the Bundle product to the shopping cart
7. Go to the shopping cart
8. Press the "Edit" button in order to edit the Bundle product

Expected result

1. The quantity of the option should be the user defined one

Actual result

1. The quantity of the option is not the user defined one. It is the selections' default quantity.

Debugging until now

1. On page load the quantity is the user defined one (see variable $_defaultQty in radio.phtml).
2. Then the value (property, not the attribute) of the input field is changed through Javascript
3. Don't know were this happens exactly but for sure the _onBundleOptionChanged(event) of the price-bundle.js is involved.

[RomanKrut]

Internal ticket was created for this issue - MAGETWO-69959