Example - I have ETH on Arbitrum (no other token for gas). I want to send it all to another address or bridge it somewhere else.

Many times when I do that i go back and forth with the editing until i find that sweet spot where I send all my balance and keep just enough for gas.

I don't want to do that. When i select all balance and click continue i want to be told how much it costs me and that the amount has to be deducted from the total balance.