Bad label positioning in pie-charts

Depending on the number of categories and the amount of text in labels, the positioning of labels in pie-charts might be unsatisfying. The labels might overlap the title/subtitle. Here is an example image showing the problem:

This codepen contains relevant code for reproducing the issue.

There is also a related issue, which suggests adding an optional space between title and plot. But as this space would definitively depend on the actual data, I'd say plotly should handle this for the user automatically.

从链接的 CodePen 复现开始，并将其与相关 issue #4932 进行比较。跟踪饼图标签布局在类别数量和标签长度不同时的行为，然后验证标签不再与标题或副标题重叠，同时保持可读的位置。