Plotly not showing subgroup identificator in horizontal version

Using the horizontal version, Plotly doesn't show the subgroup identification. I thought if my code was wrong, but no, because in vertical mode, it shows perfectly. It can be fixed setting the left margin.

trace1 = go.Bar(x = [ 5, 7, 9, 2 ],
y = [["Orgao A", "Orgao A", "Orgao B", "Orgao B" ],
["Empregado", "Empresa", "Empregado", "Empresa"]],
orientation="h",
name="Deferido" )
trace2 = go.Bar(x = [ 3, 5, 8, 6 ],
y = [["Orgao A", "Orgao A", "Orgao B", "Orgao B" ],
["Empregado", "Empresa", "Empregado", "Empresa"]],
orientation="h",
name="Indeferido" )
layout = go.Layout( barmode="stack", barnorm="percent" ) #, margin=dict(l=200) #this fix the problem
fig = go.Figure( data = [ trace1, trace2 ], layout=layout )
iplot( fig )

首先執行提供的 Python 範例，並比較水平模式和垂直模式，包括左邊距 workaround。追蹤負責水平群組長條圖中子群組標籤的 plotly.js 版面配置路徑。完成的標準是：不需要手動增加左邊距即可呈現子群組識別，且該範例具有回歸涵蓋。