message: Some improved debug code.
diff: @@ -390,6 +390,9 @@ class EtEmbeddedViewer extends ViewerElement implements CommandPaletteRequestTyp
  bulkSetMode(newMode: ViewerElementTypes.Mode): BulkDOMOperation.BulkDOMOperation {
  const generator = function* generator(this: EtEmbeddedViewer): IterableIterator<BulkDOMOperation.GeneratorPhase> {
  + if (DEBUG_SIZE) {
  + this._log.debug("bulkSetMode() generator: newMode=", newMode);
  + }
  yield BulkDOMOperation.GeneratorPhase.BEGIN_FINISH;
  return BulkDOMOperation.GeneratorPhase.DONE;
  