Hovertemplate not using single text value for all data points

Hi there 👋, stumbled across this issue while playing around with hovertemplates in Plotly.NET.

The text property can be either set with an array of values (-> every data point gets its own text for hover display), or with a single value (-> every data point gets the same text)

This works well unless the text is used in a hover template. When using an array of text, these values are displayed correctly. But when using a single text for all datums, it does not display on hover.

Expected behavior: Hover template uses the single string of the text property for each hoverlabel
Actual behavior: Hoverlabels display %text

Here is a jsfiddle: https://jsfiddle.net/vsm79h3q/

首先在链接的 jsfiddle 中复现 hovertemplate 的行为，将数组值的 text 属性与单个字符串进行比较。跟踪 hovertemplate 对标量文本值的处理，并验证完成的更改会在每个 hoverlabel 中显示同一个字符串，而不是 %text。