message: Normalize that path on storage!
diff: @@ -60,7 +60,8 @@ export class CppConfigurationProvider implements cpt.CustomConfigurationProvider
  const config = this._buildConfigurationData(grp, opts);
  for (const src of grp.sources) {
  const abs = path.isAbsolute(src) ? src : path.join(sourceDir, src);
  - this._fileIndex.set(abs, {
  + const abs_norm = util.normalizePath(abs);
  + this._fileIndex.set(abs_norm, {
  uri: vscode.Uri.file(abs).toString(),
  configuration: config,
  });
  