fix error dragging outside of window in FF, close #2610
fix error dragging outside of window in FF, close #2610

wrrnwng/Leaflet,twoubt/Leaflet,AP-whitehat/Leaflet,pzdz/Leaflet,akrzyzanowskino/TeamSE,caiiiycuk/Leaflet,bbecquet/Leaflet,elfalem/Leaflet,msiadak/Leaflet,tormi/Leaflet,dhootha/Leaflet,jasonoverland/Leaflet,huangsong/Leaflet,nycitt/Leaflet,Fil/Leaflet,nkovacs/Leaflet,waeltken/Leaflet,geoloep/Leaflet,fillerwriter/Leaflet,kjell/Leaflet,starsolaris/Leaflet,beni55/Leaflet,twoubt/Leaflet,billybonz1/Leaflet,RobertoMalatesta/Leaflet,fab1an/Leaflet,codeator/Leaflet,Neorth/Leaflet,elkingtonmcb/Leaflet,psicomante/Leaflet,juliensoret/Leaflet,pakro/Leaflet,mstahv/Leaflet,RLRR/Leaflet,CapeSepias/Leaflet,frogcat/Leaflet,scaddenp/Leaflet,Srikanth4/Leaflet,alex2wong/Leaflet,msiadak/Leaflet,cartant/Leaflet,davidlukerice/Leaflet,brah/Leaflet,frogcat/Leaflet,elkingtonmcb/Leaflet,iOffice/Leaflet,CorainChicago/Leaflet,olafurr/Leaflet,nycitt/Leaflet,iOffice/Leaflet,davidlukerice/Leaflet,Jakobud/Leaflet,litnerdy/Leaflet,billybonz1/Leaflet,prashen/Leaflet,northerneyes/Leaflet,Leaflet/Leaflet,brunocasanova/frontend-asset-leaflet,tbassett44/Leaflet,billybonz1/Leaflet,alex2wong/Leaflet,cmulders/Leaflet,grahamthompson/Leaflet,DrillingInfo/Leaflet,2gis/Leaflet,davidlukerice/Leaflet,bolshoibooze/Leaflet,RobertoMalatesta/Leaflet,stefanocudini/Leaflet,jmutua2015/Leaflet,codeator/Leaflet,2gis/Leaflet,beni55/Leaflet,msiadak/Leaflet,iamjonbradley/Leaflet,MuellerMatthew/Leaflet,taraszerebecki/Leaflet,akauppi/Leaflet,nathancahill/Leaflet,scaddenp/Leaflet,wpf500/Leaflet,Andrey-Pavlov/Leaflet,elfalem/Leaflet,webmechanicx/Leaflet,tomnod/Leaflet,sisou/Leaflet,klaftertief/Leaflet,kumy/Leaflet,bolshoibooze/Leaflet,eriksjaastad/Leaflet,codeator/Leaflet,RyanHickman/Leaflet,jasonoverland/Leaflet,cartant/Leaflet,Ubisense/Leaflet,bbecquet/Leaflet,mourner/Leaflet,nycitt/Leaflet,stefanocudini/Leaflet,gabrielpconceicao/frontend-asset-leaflet,javimolla/Leaflet,olafurr/Leaflet,snkashis/Leaflet,brah/Leaflet,snkashis/Leaflet,Ossehoht/Leaflet,nkovacs/Leaflet,davojta/Leaflet,jmutua2015/Leaflet,twoubt/Leaflet,caiiiycuk/Leaflet,mbrukman/Leaflet,CapeSepias/Leaflet,Ossehoht/Leaflet,klaftertief/Leaflet,fab1an/Leaflet,elfalem/Leaflet,mediasuitenz/Leaflet,fillerwriter/Leaflet,Neorth/Leaflet,lee101/Leaflet,geoloep/Leaflet,iamjonbradley/Leaflet,nvoron23/Leaflet,tbassett44/Leaflet,tsantacruz/RotationalMarker,mbrukman/Leaflet,akrzyzanowskino/TeamSE,bolshoibooze/Leaflet,AP-whitehat/Leaflet,lee101/Leaflet,fredericksilva/Leaflet,gabrielpconceicao/frontend-asset-leaflet,prashen/Leaflet,Leaflet/Leaflet,olafurr/Leaflet,jasonoverland/Leaflet,Srikanth4/Leaflet,wancharle/Leaflet,litnerdy/Leaflet,sambernet/Leaflet,beni55/Leaflet,pakro/Leaflet,tbassett44/Leaflet,devjoseluis/Leaflet,dhootha/Leaflet,geoloep/Leaflet,lee101/Leaflet,huangsong/Leaflet,MuellerMatthew/Leaflet,MuellerMatthew/Leaflet,Trufi/Leaflet,pzdz/Leaflet,Andrey-Pavlov/Leaflet,w8r/Leaflet,mstahv/Leaflet,wrrnwng/Leaflet,caiiiycuk/Leaflet,wpf500/Leaflet,psicomante/Leaflet,cmulders/Leaflet,Ubisense/Leaflet,pakro/Leaflet,dhootha/Leaflet,eriksjaastad/Leaflet,brunocasanova/frontend-asset-leaflet,tsantacruz/RotationalMarker,RLRR/Leaflet,starsolaris/Leaflet,iZucken/Leaflet,klaftertief/Leaflet,rlugojr/Leaflet,nikhildhamsaniya/Leaflet,2gis/Leaflet,fredericksilva/Leaflet,northerneyes/Leaflet,fab1an/Leaflet,huangsong/Leaflet,elkingtonmcb/Leaflet,fillerwriter/Leaflet,iZucken/Leaflet,bbecquet/Leaflet,brah/Leaflet,sellonen/Leaflet,pzdz/Leaflet,Jakobud/Leaflet,w8r/Leaflet,sellonen/Leaflet,taraszerebecki/Leaflet,thalesfsp/Leaflet,nikhildhamsaniya/Leaflet,wpf500/Leaflet,tomnod/Leaflet,msokk/Leaflet,mediasuitenz/Leaflet,iZucken/Leaflet,scaddenp/Leaflet,thalesfsp/Leaflet,AP-whitehat/Leaflet,kumy/Leaflet,DrillingInfo/Leaflet,brunocasanova/frontend-asset-leaflet,psicomante/Leaflet,nvoron23/Leaflet,mstahv/Leaflet,davojta/Leaflet,Fil/Leaflet,CorainChicago/Leaflet,Fil/Leaflet,mbrukman/Leaflet,nathancahill/Leaflet,cartant/Leaflet,jblarsen/Leaflet,Ubisense/Leaflet,RobertoMalatesta/Leaflet,tsantacruz/RotationalMarker,webmechanicx/Leaflet,gabrielpconceicao/frontend-asset-leaflet,wrrnwng/Leaflet,mourner/Leaflet,hyperknot/Leaflet,RyanHickman/Leaflet,wancharle/Leaflet,grahamthompson/Leaflet,AndBicScadMedia/Leaflet,javimolla/Leaflet,taraszerebecki/Leaflet,tomnod/Leaflet,kjell/Leaflet,Ossehoht/Leaflet,grahamthompson/Leaflet,sambernet/Leaflet,Jakobud/Leaflet,waeltken/Leaflet,Mark-Wood/Leaflet,juliensoret/Leaflet,devjoseluis/Leaflet,Mark-Wood/Leaflet,mourner/Leaflet,webmechanicx/Leaflet,tormi/Leaflet,CapeSepias/Leaflet,RyanHickman/Leaflet,nikhildhamsaniya/Leaflet,AndBicScadMedia/Leaflet,andrewmartini/Leaflet,rlugojr/Leaflet,starsolaris/Leaflet,eriksjaastad/Leaflet,stefanocudini/Leaflet,CorainChicago/Leaflet,Trufi/Leaflet,akauppi/Leaflet,andrewmartini/Leaflet,Srikanth4/Leaflet,sisou/Leaflet,rlugojr/Leaflet,jblarsen/Leaflet,yohanboniface/Leaflet,mediasuitenz/Leaflet,RLRR/Leaflet,litnerdy/Leaflet,Andrey-Pavlov/Leaflet,devjoseluis/Leaflet,sellonen/Leaflet,wancharle/Leaflet,snkashis/Leaflet,akauppi/Leaflet,davojta/Leaflet,iOffice/Leaflet,Trufi/Leaflet,prashen/Leaflet,akrzyzanowskino/TeamSE,sambernet/Leaflet,thalesfsp/Leaflet,hyperknot/Leaflet,sisou/Leaflet,w8r/Leaflet,andrewmartini/Leaflet,javimolla/Leaflet,jmutua2015/Leaflet,frogcat/Leaflet,tormi/Leaflet,yohanboniface/Leaflet,AndBicScadMedia/Leaflet,waeltken/Leaflet,alex2wong/Leaflet,iamjonbradley/Leaflet,kumy/Leaflet,jblarsen/Leaflet,fredericksilva/Leaflet,hyperknot/Leaflet,Neorth/Leaflet,Leaflet/Leaflet,nathancahill/Leaflet,yohanboniface/Leaflet,msokk/Leaflet,cmulders/Leaflet,msokk/Leaflet