`documentHighlightProvider` capability

[ssoher]

I find it useful when other occurances of the symbol under the caret are highlighted, makes it easy seeing the immediate usages. But this doesn't seem to work in LSP-OmniSharp even when I change document_highlight_style to background and add the related scopes with custom background colors to my color theme (using this as a guide https://lsp.sublimetext.io/customization/#document-highlights).

Do we have the required capability in the server, am I doing something wrong?