Under what circumstances does the seller lose the right to revoke the sale when the bankrupt buyer gains the means to pay?

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The seller loses the right to revoke the sale if the creditors waive their claims, enabling the buyer to pay, or if someone gifts the buyer property, enabling him to pay, or if the value of the bankrupt's assets increases sufficiently to cover all the creditors' claims, making the payment of the price possible. In these situations, the cause for revocation ceases to exist. Furthermore, since the seller could have received the price from the buyer, he does not have the right to revoke the sale, just as if bankruptcy had never occurred.