Sterling treads water before UK lawmakers vote on election

LONDON (Reuters) - Sterling edged higher against a broadly struggling dollar on Monday as traders awaited the outcome of a vote in British Parliament on Prime Minister Boris Johnson's demand for a general election.A House of Commons vote is due around 1900 GMT, with lawmakers deciding on whether to approve Johnson's request in return for more time to adopt his Brexit deal.Johnson needs the support of two thirds of parliament's 650 members to trigger a new election. European Council President..