rescale image if width or height is specified in ImageWidget
rescale image if width or height is specified in ImageWidget

robert00s/koreader,noname007/koreader,mwoz123/koreader,Frenzie/koreader,poire-z/koreader,chihyang/koreader,koreader/koreader,Markismus/koreader,apletnev/koreader,mihailim/koreader,ashhher3/koreader,NiLuJe/koreader,poire-z/koreader,chrox/koreader,koreader/koreader,Frenzie/koreader,NickSavage/koreader,ashang/koreader,frankyifei/koreader,NiLuJe/koreader,Hzj-jie/koreader,pazos/koreader,houqp/koreader,lgeek/koreader