Function: _removeUnfillableOrder(PerpBook ds, Order order)

This internal function removes a limit order from the order book if the maker and taker are the same (self-trade), the order has expired, and the maker position becomes liquidatable during the processMakerFill execution.

Branches and code coverage

Intended branches

• collateralRefund is calculated correctly.

  Test coverage

• orderbookCollateral in the GTL contract is updated correctly.

  Test coverage

• The order is fully removed from the order book.

  Test coverage

• quoteTokenOpenInterest is updated properly when side == Side.BUY.

  Test coverage

• baseTokenOpenInterest is updated properly when side == Side.SELL.

  Test coverage