message: fix(canvas): fix extra save caused in dirty rect. apache/echarts#15005
diff: @@ -393,8 +393,6 @@ export default class CanvasPainter implements PainterBase {
  const repaintRects = useDirtyRect
  && layer.createRepaintRects(list, prevList, this._width, this._height);
  - ctx.save();
  -
  let start = paintAll ? layer.__startIndex : layer.__drawIndex;
  const useTimer = !paintAll && layer.incremental && Date.now;
  