TableAwareBlockQuoteMarkerProvider

A > at the start of a GFM table cell is lexed as a MarkdownTokenTypes.BLOCK_QUOTE marker token, but block quotes are not allowed inside table cells. HtmlGenerator.leafText blanks out block-quote marker tokens, so without special handling the > would disappear from the rendered cell. Inside a table cell we render the marker as literal text; anywhere else we keep the default behaviour of dropping the marker.