message: Update codemirror.client.js
  Force C++ syntax highlighting on all .h files.
diff: @@ -100,10 +100,10 @@ const CodemirrorClient = new EditorClient(
  }
  case 'hpp':
  case 'cpp':
  + case 'h':
  return {
  name: 'text/x-c++src',
  }
  - case 'h':
  case 'c':
  return {
  name: 'text/x-csrc',
  