message: Fix bug where OffscreenCanvas.getContext is null
diff: @@ -706,9 +706,7 @@ const canvas = (() =>
  // OffscreenCanvas2D measureText can be up to 40% faster.
  const c = new OffscreenCanvas(0, 0);
  - c.getContext('2d');
  -
  - return c;
  + return c.getContext('2d') ? c : document.createElement('canvas');
  }
  catch (ex)
  {
  