Don't allow dragging of the map when the click starts in a button
Don't allow dragging of the map when the click starts in a button

Fixes #1869
mapmeld/iD,1ec5/iD,openstreetmap/iD,tbicr/iD,andreic-telenav/iD,kepta/iD,zbycz/iD,morray/iD,edpop/iD,bagage/iD,digidem/iD,openstreetmap/iD,edpop/iD,mapmeld/iD,digidem/iD,zbycz/iD,andreic-telenav/iD,openstreetmap/iD,tbicr/iD,1ec5/iD,AndreasHae/iD,energiekollektiv/openmod.sh-id,1ec5/iD,AndreasHae/iD,ngageoint/hootenanny-ui,energiekollektiv/openmod.sh-id,ngageoint/hootenanny-ui,morray/iD,kartta-labs/iD,mapmeld/iD,edpop/iD,kartta-labs/iD,AndreasHae/iD,bagage/iD,kartta-labs/iD,ngageoint/hootenanny-ui,kepta/iD,bagage/iD