Re: visibilitychange event

Ah, yes, good pickup, thanks.  Final, final code:  :-)

import com.google.gwt.user.client.Command;

private static native final String getVisibilityState()/*-{
  return $doc.visibilityState;
}-*/;

private static native final void listenForVisibilityChange(Command onChange) /*-{
  $doc.addEventListener("visibilitychange", $entry(function() {

    onChange.@com.google.gwt.user.client.Command::execute(*)();
  }), false);
}-*/;

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