codemirror6 不支持viewportMargin配置

codemirror6 不支持viewportMargin配置

codemirror6版本

codemirror版本：codemirrorv6.0.1

viewportMargin配置支持情况

在codemirror5中可以通过配置viewportMargin来确保文档的全文始终被渲染，但是在codemirror6中并不支持该选项。

codemirror5中可以通过配置无限的大区别整个文档总是渲染，但是那会消耗性能。

viewportMargin: integer

Specifies the amount of lines that are rendered above and below the part of the document that’s currently scrolled into view. This affects the amount of updates needed when scrolling, and the amount of work that such an update does. You should usually leave it at its default, 10. Can be set to Infinity to make sure the whole document is always rendered, and thus the browser’s text search works on it. This will have bad effects on performance of big documents.