Debounce drawGutter with requestAnimationFrame
#164
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See #163 (comment).
This is a first step towards batching DOM updates. Although this is a huge improvement over the current setup, it can be done much better. Right now, all the work is still happening upfront it's just debounced.
From: https://github.com/facebook/nuclide
Before:
After:
This takes init time from 127ms to 55ms.
cc: @jerone