Fix an unnecessary cancel/re-request with GitHub Copilot requests.

Author: sean-mcmanus

Extension/src/LanguageServer/client.ts

@@ -2318,9 +2318,13 @@ export class DefaultClient implements Client {
             }
         }
 
+        // Don't cancel if the result has already been computed, because the result might still be usable
+        // without needing to send an unnecessary re-request, which is the case for the callback to registerRelatedFilesProvider.
+        /*
         if (token.isCancellationRequested) {
             throw new vscode.CancellationError();
         }
+        */
 
         return result;
     }