fix drag&drop of images with # char (#867)
fix drag&drop of images with # char (#867)

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