Fix TileLayer._update so it doesn't break drag-then-pinch interactions.
Fix TileLayer._update so it doesn't break drag-then-pinch interactions.

bbecquet/Leaflet,brah/Leaflet,devjoseluis/Leaflet,davojta/Leaflet,RyanHickman/Leaflet,codeator/Leaflet,rlugojr/Leaflet,nathancahill/Leaflet,elfalem/Leaflet,CapeSepias/Leaflet,CapeSepias/Leaflet,scaddenp/Leaflet,pzdz/Leaflet,Trufi/Leaflet,sisou/Leaflet,jasonoverland/Leaflet,Ubisense/Leaflet,mediasuitenz/Leaflet,Leaflet/Leaflet,nathancahill/Leaflet,bbecquet/Leaflet,MuellerMatthew/Leaflet,brah/Leaflet,tsantacruz/RotationalMarker,Neorth/Leaflet,pakro/Leaflet,MuellerMatthew/Leaflet,frogcat/Leaflet,msiadak/Leaflet,devjoseluis/Leaflet,frogcat/Leaflet,RyanHickman/Leaflet,Leaflet/Leaflet,geoloep/Leaflet,cmulders/Leaflet,alex2wong/Leaflet,Srikanth4/Leaflet,klaftertief/Leaflet,nikhildhamsaniya/Leaflet,Srikanth4/Leaflet,rlugojr/Leaflet,iOffice/Leaflet,fab1an/Leaflet,iOffice/Leaflet,pzdz/Leaflet,scaddenp/Leaflet,scaddenp/Leaflet,RyanHickman/Leaflet,beni55/Leaflet,stefanocudini/Leaflet,beni55/Leaflet,Trufi/Leaflet,elkingtonmcb/Leaflet,kumy/Leaflet,wpf500/Leaflet,pakro/Leaflet,elfalem/Leaflet,wpf500/Leaflet,tomnod/Leaflet,devjoseluis/Leaflet,nikhildhamsaniya/Leaflet,wrrnwng/Leaflet,Ubisense/Leaflet,klaftertief/Leaflet,iZucken/Leaflet,codeator/Leaflet,elkingtonmcb/Leaflet,Trufi/Leaflet,jasonoverland/Leaflet,Ossehoht/Leaflet,pakro/Leaflet,cmulders/Leaflet,mediasuitenz/Leaflet,bbecquet/Leaflet,wpf500/Leaflet,kumy/Leaflet,w8r/Leaflet,AP-whitehat/Leaflet,akrzyzanowskino/TeamSE,Ossehoht/Leaflet,w8r/Leaflet,hyperknot/Leaflet,Leaflet/Leaflet,stefanocudini/Leaflet,codeator/Leaflet,iZucken/Leaflet,wrrnwng/Leaflet,hyperknot/Leaflet,davojta/Leaflet,mediasuitenz/Leaflet,jblarsen/Leaflet,elfalem/Leaflet,fab1an/Leaflet,geoloep/Leaflet,MuellerMatthew/Leaflet,snkashis/Leaflet,beni55/Leaflet,msiadak/Leaflet,tsantacruz/RotationalMarker,iOffice/Leaflet,w8r/Leaflet,Neorth/Leaflet,sisou/Leaflet,cmulders/Leaflet,sisou/Leaflet,frogcat/Leaflet,Ubisense/Leaflet,geoloep/Leaflet,javimolla/Leaflet,CapeSepias/Leaflet,hyperknot/Leaflet,tsantacruz/RotationalMarker,snkashis/Leaflet,akrzyzanowskino/TeamSE,nathancahill/Leaflet,snkashis/Leaflet,jasonoverland/Leaflet,Ossehoht/Leaflet,wrrnwng/Leaflet,kumy/Leaflet,Srikanth4/Leaflet,brah/Leaflet,jblarsen/Leaflet,msiadak/Leaflet,tomnod/Leaflet,davojta/Leaflet,nikhildhamsaniya/Leaflet,alex2wong/Leaflet,jblarsen/Leaflet,pzdz/Leaflet,klaftertief/Leaflet,stefanocudini/Leaflet,tomnod/Leaflet,fab1an/Leaflet,elkingtonmcb/Leaflet,rlugojr/Leaflet,AP-whitehat/Leaflet,akrzyzanowskino/TeamSE,AP-whitehat/Leaflet,iZucken/Leaflet,javimolla/Leaflet,javimolla/Leaflet,alex2wong/Leaflet,Neorth/Leaflet