How to update status of ProgressIndicator from within GlobalInspectionContextExtension

I have source code like:

public class MyInspectionContext implements GlobalInspectionContextExtension< MyInspectionContext > {
          @Override
          public void performPreRunActivities(...) {
                 ProgressManager.getInstance().getProgressIndicator().setFraction(0.01);
                 ProgressManager.getInstance().getProgressIndicator().setText("Test");
                 ProgressManager.getInstance().getProgressIndicator().setText2("change me");
                 ... code which takes more then a minute ...
          }
}

But any actions on setFraction() or setText() seems to have no effect, instead you always see "Inspecting Code...".
How to change the status information of the progressIndicator within GlobalInspectionContextExtension?