dart1.dart

// Pre copy-paste
          getAccount(accountId)
            .filterMap((account) =>
              account.details.owner != modifier
                ? Some(
                  "Can't modify a transaction $eventToModifyRef in account $accountId that you don't own: "
                  "owner=${account.details.owner}, modifier=$modifier"
                )
                : const Option.none()
            )
            
// pasting into here:
            
                        return getAccount(newTxData.accountId)
                          .filterMap((newAccount) {
                            final either =
                              originalAccount.delTx(modifyEventRef, eventToModifyRef, _eventDatas, accountId);
                            if (either.isLeft) return either.left;
                            either.rightOrThrow();
                            newAccount.addTx(eventToModifyRef, newTx, newTxData.total);
                            return const Option.none();
                          })
                          .left;

// after copy paste

                        return getAccount(newTxData.accountId)
                          .filterMap((account) =>
                        account.details.owner != modifier
                          ? Some(
                          "Can't modify a transaction $eventToModifyRef in account $accountId that you don't own: "
                            "owner=${account.details.owner}, modifier=$modifier"
                        )
                          : const Option.none()
                        )
                          .filterMap((newAccount) {
                            final either =
                              originalAccount.delTx(modifyEventRef, eventToModifyRef, _eventDatas, accountId);
                            if (either.isLeft) return either.left;
                            either.rightOrThrow();
                            newAccount.addTx(eventToModifyRef, newTx, newTxData.total);
                            return const Option.none();
                          })
                          .left;

// after manual formatting

                        return getAccount(newTxData.accountId)
                          .filterMap((account) =>
                            account.details.owner != modifier
                              ? Some(
                                "Can't modify a transaction $eventToModifyRef in account ${newTxData.accountId} "
                                "that you don't own: owner=${account.details.owner}, modifier=$modifier"
                              )
                              : const Option.none()
                          )
                          .filterMap((newAccount) {
                            final either =
                              originalAccount.delTx(modifyEventRef, eventToModifyRef, _eventDatas, accountId);
                            if (either.isLeft) return either.left;
                            either.rightOrThrow();
                            newAccount.addTx(eventToModifyRef, newTx, newTxData.total);
                            return const Option.none();
                          })
                          .left;

// after dartfmt

                          return getAccount(newTxData.accountId)
                              .filterMap((account) => account.details.owner != modifier
                                  ? Some(
                                      "Can't modify a transaction $eventToModifyRef in account ${newTxData.accountId} "
                                      "that you don't own: owner=${account.details.owner}, modifier=$modifier")
                                  : const Option.none())
                              .filterMap((newAccount) {
                            // !!! What is this? Why is this indented LESS than previous line?
                            final either =
                                originalAccount.delTx(modifyEventRef, eventToModifyRef, _eventDatas, accountId);
                            if (either.isLeft) return either.left;
                            either.rightOrThrow();
                            newAccount.addTx(eventToModifyRef, newTx, newTxData.total);
                            return const Option.none();
                          // !!! What is this? Why is this indented LESS than opening block?
                          }).left;