Properly unsubscribe Layer events 
Properly unsubscribe Layer events 

I've just bumped into this while browsing the source code. It's not tested in any way and I didn't look for similar issues in other files neither. But I hope it helps anyway.
alex2wong/Leaflet,alex2wong/Leaflet,bbecquet/Leaflet,andrewmartini/Leaflet,davojta/Leaflet,cartant/Leaflet,tbassett44/Leaflet,hyperknot/Leaflet,yohanboniface/Leaflet,RLRR/Leaflet,wrrnwng/Leaflet,2gis/Leaflet,snkashis/Leaflet,mstahv/Leaflet,Fil/Leaflet,tsantacruz/RotationalMarker,psicomante/Leaflet,yohanboniface/Leaflet,akrzyzanowskino/TeamSE,fredericksilva/Leaflet,wpf500/Leaflet,CapeSepias/Leaflet,davidlukerice/Leaflet,billybonz1/Leaflet,RobertoMalatesta/Leaflet,beni55/Leaflet,taraszerebecki/Leaflet,dhootha/Leaflet,northerneyes/Leaflet,tormi/Leaflet,olafurr/Leaflet,RyanHickman/Leaflet,hyperknot/Leaflet,lee101/Leaflet,bolshoibooze/Leaflet,frogcat/Leaflet,nycitt/Leaflet,juliensoret/Leaflet,thalesfsp/Leaflet,fillerwriter/Leaflet,fab1an/Leaflet,stefanocudini/Leaflet,mediasuitenz/Leaflet,Fil/Leaflet,nycitt/Leaflet,pzdz/Leaflet,Leaflet/Leaflet,beni55/Leaflet,RobertoMalatesta/Leaflet,webmechanicx/Leaflet,jblarsen/Leaflet,tormi/Leaflet,Leaflet/Leaflet,jasonoverland/Leaflet,caiiiycuk/Leaflet,elkingtonmcb/Leaflet,devjoseluis/Leaflet,codeator/Leaflet,lee101/Leaflet,frogcat/Leaflet,cartant/Leaflet,MuellerMatthew/Leaflet,Andrey-Pavlov/Leaflet,waeltken/Leaflet,CapeSepias/Leaflet,Andrey-Pavlov/Leaflet,fredericksilva/Leaflet,davojta/Leaflet,brah/Leaflet,mbrukman/Leaflet,Neorth/Leaflet,Fil/Leaflet,twoubt/Leaflet,northerneyes/Leaflet,hyperknot/Leaflet,Trufi/Leaflet,AP-whitehat/Leaflet,AP-whitehat/Leaflet,caiiiycuk/Leaflet,wpf500/Leaflet,akrzyzanowskino/TeamSE,tomnod/Leaflet,Jakobud/Leaflet,webmechanicx/Leaflet,DrillingInfo/Leaflet,eriksjaastad/Leaflet,elfalem/Leaflet,mourner/Leaflet,elfalem/Leaflet,2gis/Leaflet,Leaflet/Leaflet,Neorth/Leaflet,cmulders/Leaflet,iZucken/Leaflet,DrillingInfo/Leaflet,mourner/Leaflet,nvoron23/Leaflet,kumy/Leaflet,fab1an/Leaflet,msokk/Leaflet,waeltken/Leaflet,CapeSepias/Leaflet,sellonen/Leaflet,nikhildhamsaniya/Leaflet,bbecquet/Leaflet,jasonoverland/Leaflet,waeltken/Leaflet,andrewmartini/Leaflet,akrzyzanowskino/TeamSE,sisou/Leaflet,geoloep/Leaflet,sambernet/Leaflet,Jakobud/Leaflet,stefanocudini/Leaflet,mstahv/Leaflet,klaftertief/Leaflet,sisou/Leaflet,psicomante/Leaflet,litnerdy/Leaflet,Ossehoht/Leaflet,nycitt/Leaflet,geoloep/Leaflet,Ubisense/Leaflet,iOffice/Leaflet,bbecquet/Leaflet,wpf500/Leaflet,snkashis/Leaflet,litnerdy/Leaflet,klaftertief/Leaflet,RLRR/Leaflet,javimolla/Leaflet,juliensoret/Leaflet,grahamthompson/Leaflet,iOffice/Leaflet,mstahv/Leaflet,nathancahill/Leaflet,jmutua2015/Leaflet,msiadak/Leaflet,codeator/Leaflet,w8r/Leaflet,iamjonbradley/Leaflet,kumy/Leaflet,sisou/Leaflet,billybonz1/Leaflet,CorainChicago/Leaflet,elkingtonmcb/Leaflet,davojta/Leaflet,Trufi/Leaflet,CorainChicago/Leaflet,kumy/Leaflet,jmutua2015/Leaflet,tomnod/Leaflet,pzdz/Leaflet,Andrey-Pavlov/Leaflet,mediasuitenz/Leaflet,pzdz/Leaflet,javimolla/Leaflet,wrrnwng/Leaflet,mourner/Leaflet,prashen/Leaflet,davidlukerice/Leaflet,akauppi/Leaflet,elkingtonmcb/Leaflet,mbrukman/Leaflet,brah/Leaflet,Neorth/Leaflet,webmechanicx/Leaflet,frogcat/Leaflet,Ubisense/Leaflet,RobertoMalatesta/Leaflet,msiadak/Leaflet,MuellerMatthew/Leaflet,akauppi/Leaflet,Jakobud/Leaflet,eriksjaastad/Leaflet,msokk/Leaflet,tormi/Leaflet,RyanHickman/Leaflet,CorainChicago/Leaflet,jasonoverland/Leaflet,huangsong/Leaflet,pakro/Leaflet,taraszerebecki/Leaflet,msiadak/Leaflet,iamjonbradley/Leaflet,scaddenp/Leaflet,billybonz1/Leaflet,starsolaris/Leaflet,wrrnwng/Leaflet,dhootha/Leaflet,Srikanth4/Leaflet,tsantacruz/RotationalMarker,wancharle/Leaflet,devjoseluis/Leaflet,rlugojr/Leaflet,psicomante/Leaflet,jmutua2015/Leaflet,w8r/Leaflet,msokk/Leaflet,codeator/Leaflet,AndBicScadMedia/Leaflet,grahamthompson/Leaflet,davidlukerice/Leaflet,tbassett44/Leaflet,dhootha/Leaflet,AP-whitehat/Leaflet,nvoron23/Leaflet,huangsong/Leaflet,olafurr/Leaflet,2gis/Leaflet,sambernet/Leaflet,rlugojr/Leaflet,AndBicScadMedia/Leaflet,klaftertief/Leaflet,twoubt/Leaflet,Srikanth4/Leaflet,iZucken/Leaflet,iZucken/Leaflet,RLRR/Leaflet,pakro/Leaflet,nathancahill/Leaflet,RyanHickman/Leaflet,Ubisense/Leaflet,pakro/Leaflet,lee101/Leaflet,andrewmartini/Leaflet,wancharle/Leaflet,brah/Leaflet,Ossehoht/Leaflet,AndBicScadMedia/Leaflet,wancharle/Leaflet,nathancahill/Leaflet,eriksjaastad/Leaflet,prashen/Leaflet,kjell/Leaflet,Trufi/Leaflet,bolshoibooze/Leaflet,yohanboniface/Leaflet,tomnod/Leaflet,thalesfsp/Leaflet,sellonen/Leaflet,beni55/Leaflet,huangsong/Leaflet,snkashis/Leaflet,stefanocudini/Leaflet,olafurr/Leaflet,Srikanth4/Leaflet,fredericksilva/Leaflet,cartant/Leaflet,tbassett44/Leaflet,jblarsen/Leaflet,cmulders/Leaflet,scaddenp/Leaflet,prashen/Leaflet,nikhildhamsaniya/Leaflet,geoloep/Leaflet,elfalem/Leaflet,scaddenp/Leaflet,jblarsen/Leaflet,twoubt/Leaflet,devjoseluis/Leaflet,starsolaris/Leaflet,tsantacruz/RotationalMarker,thalesfsp/Leaflet,cmulders/Leaflet,iOffice/Leaflet,Ossehoht/Leaflet,javimolla/Leaflet,bolshoibooze/Leaflet,caiiiycuk/Leaflet,mbrukman/Leaflet,grahamthompson/Leaflet,alex2wong/Leaflet,rlugojr/Leaflet,akauppi/Leaflet,fab1an/Leaflet,sambernet/Leaflet,starsolaris/Leaflet,fillerwriter/Leaflet,kjell/Leaflet,sellonen/Leaflet,w8r/Leaflet,iamjonbradley/Leaflet,litnerdy/Leaflet,fillerwriter/Leaflet,nikhildhamsaniya/Leaflet,mediasuitenz/Leaflet,MuellerMatthew/Leaflet,taraszerebecki/Leaflet