The post-election game of horse trading faces its first test on Monday as leaders of the European Union meet in Brussels to discuss, and possibly assign, the bloc’s top jobs. The informal summit will see the 27 heads of state and government haggle over who should be the next president of the European Commission, president of the European Council and High Representative for Foreign Affairs and Security Policy. The negotiations have traditionally been a delicate juggling act: the distribution of top jobs needs to consider political affiliations, geographical origins and gender balance to ensure …