I found a "solution" that works.
Just call the new RemoteView without a progress bar on its layout when the task is completed
In the tutorial that I'm using, I have this progress.xml:
  notification.contentView = new RemoteViews(getApplicationContext().getPackageName(), R.layout.progress); 
when the task makes a 100% call:
  notification.contentView = new RemoteViews(getApplicationContext().getPackageName(), R.layout.done); 
so layout done.xml replaces progress.xml
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