legend_tracegroupgap doesn't work when legend_traceorder is used

Note: to reproduce, see here

The problem

Baseline

long_df = px.data.medals_long()

fig = px.bar(long_df, x="nation", y="count", color="medal", title="Long-Form")
fig.update_layout(width=680, height=480,)
fig.show()

works just fine:

Increasing the gap works

long_df = px.data.medals_long()

fig = px.bar(long_df, x="nation", y="count", color="medal", title="Long-Form")
fig.update_layout(autosize=False, width=680, height=480, legend_tracegroupgap=50)
fig.show()

also works fine

Increasing the gap & reversing doesn't work

long_df = px.data.medals_long()

fig = px.bar(long_df, x="nation", y="count", color="medal", title="Long-Form Input")
fig.update_layout(width=680,height=480, legend_traceorder="reversed", legend_tracegroupgap=50)
fig.show()

gives

Comienza con la reproducción de Colab enlazada y compara legend_traceorder="reversed" con legend_tracegroupgap=50 en los puntos de entrada de Plotly Python. Rastrea cómo se gestionan conjuntamente estas dos propiedades de layout. Se considera completado cuando el espacio configurado sigue siendo visible al invertir el orden de los elementos de la leyenda.