Swap safemoon failed

[xzjcool]

Bug Description

Can't swap safemoon token for most of the time, even increase the slippage to 20%.

The root cause is that the swap code will estimate swapExactTokensForETH and swapExactTokensForETHSupportingFeeOnTransferTokens. Sometimes estimate swapExactTokensForETH will succeed because of the high slippage, but can't send the tx to chain. the error is below:

The corresponding contract code is:

the balance change all the time for this kind of tokens

So tokens which charge fees need to always estimate swapExactTokensForETHSupportingFeeOnTransferTokens and use swapExactTokensForETHSupportingFeeOnTransferTokens to swap.

Steps to Reproduce

Expected Behavior

Additional Context