progress viewer will no longer fade out if toggled quickly from visible to...

progress viewer will no longer fade out if toggled quickly from visible to invisible to visible again.

indra/newview/llprogressview.cpp

@@ -133,7 +133,7 @@ void LLProgressView::setVisible(BOOL visible)
 		mFadeTimer.start();
 	}
 	// showing progress view
-	else if (!getVisible() && visible)
+	else if (visible && (!getVisible() || mFadeTimer.getStarted()))
 	{
 		setFocus(TRUE);
 		mFadeTimer.stop();