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

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