Determines how Markdown Documents are previewed when browsing in the File and Folder Browser. Single click displays the document as:

EditorPreview * editor and preview, side by side * transitory: goes away when navigating off * becomes sticky once you click into editor

HtmlPreview * previewed as full page Html document * transitory: goes away when navigating off * tab or browser menu lets you 'Open in Editor'

Double click in the folder browser opens the file as a fully editable and sticky document in editor and preview mode.

public MarkdownPreviewModes MarkdownPreviewMode