match: make 'match.files()' return list object always 'exact' match objects are sometimes created with a non-list 'pattern' argument: - using 'set' in queue.refresh():hgext/mq.py match = scmutil.matchfiles(repo, set(c[0] + c[1] + c[2] + inclsubs)) - using 'dict' in revert():mercurial/cmdutil.py (names = {}) m = scmutil.matchfiles(repo, names) 'exact' match objects return specified 'pattern' to callers of 'match.files()' as it is, so it is a non-list object. but almost all implementations expect 'match.files()' to return a list object, so this may causes problems: e.g. exception for "+" with another list object. this patch ensures that '_files' of 'exact' match objects is a list object. for non 'exact' match objects, parsing specified 'pattern' already ensures that it it a list one.