Hi Andrei,
I want to handle the stock availability for the combination attribute, so the customer will see the option(s) disabled in case the stock = 0. For example, if i have Color & Size attributes. When the customer select a color, the only available sizes should be enabled. I am trying to use the "product_attributes_changed" event but it seems it is very hard to do it, do you have any idea? shall it will be supported in 3.90?