Inconsistent `gap` attributes causes misalignment

If you provide both bargap and scattergap but they're different, traces in the same alignment and offset group do not properly align. One way or another, ensuring these traces align is more important than honoring both gaps. Here, the orange and green scatter points should be centered on the bars of the same color, but they are not:

https://codepen.io/alexcjohnson/pen/yLdEZvo?editors=0010

This is a little tricky though:

• If there are no bar traces, bargap will not be defined, so scattergap should be honored.
• Even if there are bar traces but only scattergap is explicitly given, seems like it should be honored and used as the bargap value as well.
• There are also boxgap and violingap - in principle you could have ALL of these traces in the same alignment and offset groups, do we define a hierarchy, something like bar beats scatter beats box beats violin? Or do we take the gap from the first trace in the group, and use that for all traces in that group? Or the maximum gap that applies to any trace in the group? I have no strong opinions here, so long as the result is always proper alignment.
• All but scatter also have *groupgap attributes. There's no problem allowing these to be different.

bar、scatter、box、violin トレースのアラインメントとオフセットグループの処理から始め、リンク先の CodePen を使って不一致を再現します。gap 属性がない場合と明示的に設定されている場合を比較し、そのうえで、正しいアラインメントを維持しながら共有 gap を選択する一貫したルールを確立します。同じグループに属するトレースが、関連するすべてのトレースの組み合わせで正しく中央揃えされれば完了です。