Vietnam taxes on worldwide income, exactly the same as what Thailand is proposing. Cambodia too although I understand their whole concept of tax is somewhat strange.
not trying to be tough, just merely trying to educate you on how to find answers to repeated questions instead of getting your knickers in a twist like you have here 👍
foreign income has always only been taxed in Thailand if you bring it in from overseas. That rule is in effect today. The proposed change is to tax Thai tax residents on their worldwide income irrespective of whether they bring it into Thailand or not.