public Task PreviewMarkdownCallback(bool dontGetMarkdown,
	int editorLineNumber,
	bool noPreviewScrolling)

dontGetMarkdown
If true doesn't retrieve markdown and uses MarkdownDocument.CurrentText instead

editorLineNumber
Optional line number to go to in the preview. -1 to figure out from editor position

noPreviewScrolling
if true won't scroll the preview to match editor position. If true this will override the editorLine Number