Allow to choose color with alpha chanel
Allow to choose color with alpha chanel

Perhaps it has a reason to doesn't allow this ?

Former-commit-id: 5708644fb64af46764745abd7199943fa16b3dd2
olsgreen/concrete5,olsgreen/concrete5,olsgreen/concrete5,mlocati/concrete5,rikzuiderlicht/concrete5,mlocati/concrete5,mlocati/concrete5,triplei/concrete5-8,haeflimi/concrete5,hissy/concrete5,concrete5/concrete5,mainio/concrete5,concrete5/concrete5,mainio/concrete5,deek87/concrete5,KorvinSzanto/concrete5,rikzuiderlicht/concrete5,rikzuiderlicht/concrete5,haeflimi/concrete5,concrete5/concrete5,concrete5/concrete5,KorvinSzanto/concrete5,triplei/concrete5-8,a3020/concrete5,triplei/concrete5-8,jaromirdalecky/concrete5,hissy/concrete5,deek87/concrete5,haeflimi/concrete5,KorvinSzanto/concrete5,biplobice/concrete5,deek87/concrete5,deek87/concrete5,acliss19xx/concrete5,biplobice/concrete5,MrKarlDilkington/concrete5,jaromirdalecky/concrete5,mlocati/concrete5,a3020/concrete5,hissy/concrete5,jaromirdalecky/concrete5,hissy/concrete5,MrKarlDilkington/concrete5,haeflimi/concrete5,biplobice/concrete5,jaromirdalecky/concrete5,biplobice/concrete5,MrKarlDilkington/concrete5,acliss19xx/concrete5,mainio/concrete5,acliss19xx/concrete5