ensure fmax>=fmin when rescheduling
ensure fmax>=fmin when rescheduling

LucasCabello/anki,jakesyl/ruby-card,xuewenfei/anki,florianjacob/anki,hssm/anki,holycrepe/anki,jkitching/anki,Stvad/anki,socialpercon/anki-1,Arthaey/anki,hssm/anki,kenjhim/anki,go38/anki,ospalh/libanki3,abeyer/anki,eduOS/anki,sunclx/anki,weihautin/anki,jakesyl/ruby-card,subfusc/anki,weihautin/anki