Commit 0593bde

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Fix memory leak in bar chart, part 2.

Chrome helpfully disables requestAnimationFrame in background tabs. It also slows setInterval rates. However, it does not stop setIntervals completely; therefore, this example in a background tab would continuously schedule transitions that never wake up. Flushing the timer queue explicitly guarantees that scheduled transitions have a chance to end when in the background.

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tutorial
- bar-2.markdown

`‎tutorial/bar-2.markdown‎`

-Original file line number
+Diff line change
   redraw1();
   redraw2();
   redraw3();
 +  d3.timer.flush(); // avoid memory leak when in background tab
 }, 1500);
 </script>

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