katspaugh / wavesurfer.js / 2902

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spectrogram plugin: Use ImageData to draw pixel-by-pixel (#2127)

* Use ImageData to draw pixel-by-pixel

* calling `fillStyle` and `fillRect` multiple times is thrashing the DOM
  when what we're ultimately doing is drawing pixel by pixel. ImageData
  is best suited for pixel by pixel operations.
* removed `const length` because it was unused

* Add to changelog

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