cubicweb-leaflet #4148072 display legend on MapValues [validation pending]

It would be grate to have a legend area

prioritynormal
typebug
done in0.3.0
load left0.000
closed by#b2c583e8f8c8 [views] display legend on MapValues (closes #4148072)
patch[views] display legend on MapValues (closes #4148072) [applied]