Issue

Semantic highlighting requests are not sent by QtCreator.

The semantic tokens endpoint of our custom language server (written in Python using the pygls library) works correctly with VSCode.

The capabilities are correctly detected by QtCreator.

Analysis

The filtering logic in `
SemanticTokenSupport::supportedSemanticRequests` seems to be inverted. A semantic token request will not be sent to a document matching the specified filter (MIME type, pattern, any) but will be sent to a non-matching document.
This has been verified by changing the documentSelector pattern on server side.
 
Also changing

if (docOptions.isValid()
    && docOptions.filterApplies(...))

to

if (!docOptions.isValid()
     || docOptions.filterApplies(...))  

in the `supportedRequests` lambda seems to resolve the issue.