Fix z-index on editor.
Fix z-index on editor.

mbrukman/tilemill,tizzybec/tilemill,Zhao-Qi/tilemill,fxtentacle/tilemill,mbrukman/tilemill,nyimbi/tilemill,florianf/tileoven,MappingKat/tilemill,paulovieira/tilemill-clima,Zhao-Qi/tilemill,fxtentacle/tilemill,Zhao-Qi/tilemill,MappingKat/tilemill,paulovieira/tilemill-clima,fxtentacle/tilemill,isaacs/tilemill,isaacs/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,florianf/tileoven,fxtentacle/tilemill,paulovieira/tilemill-clima,nyimbi/tilemill,Zhao-Qi/tilemill,tizzybec/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,tizzybec/tilemill,isaacs/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,tilemill-project/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,MappingKat/tilemill,makinacorpus/tilemill,Zhao-Qi/tilemill,MappingKat/tilemill,florianf/tileoven,nyimbi/tilemill,fxtentacle/tilemill,makinacorpus/tilemill,MappingKat/tilemill,mbrukman/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,nyimbi/tilemill,tizzybec/tilemill,tilemill-project/tilemill,tizzybec/tilemill,mbrukman/tilemill,tilemill-project/tilemill,nyimbi/tilemill,mbrukman/tilemill,paulovieira/tilemill-clima,paulovieira/tilemill-clima