https://ethereum.stackexchange.com/questions/145007/is-it-possible-to-do-swapbacks-buybacks-on-buy-transactions

Is it possible to do swapbacks/buybacks on buy transactions?

Normally the collected Taxes of a coin are always sold/swapped back on a sell transaction, whenever someone sells their tokens.

function swapBack(uint _amount) internal {
    address[] memory path = new address[](2);
    path[0] = address(this);
    path[1] = router.WETH();
    router.swapExactTokensForETHSupportingFeeOnTransferTokens(
        _amount,
        0,
        path,
        address(this),
        block.timestamp
    );
}

This is done by usually checking if it’s a buy or sell transaction. If the transaction is a sell, it does the swapback:

function shouldSwapBackTokens() internal view returns (bool) {
    return msg.sender != pair
    && !inSwap
    && tradingEnabled
    && _balances[address(this)] > 0;
}

For my purpose I would need that on a buy transaction as well. However, whatever I’ve tried so far, every time I enable it for buy transactions one way or another, the CA is always broken afterwards.
Now I was wondering if that’s a thing that is just not possible to do in solidity, or if it needs another approach?