[I] [Bug] ec-canvas 使用onInit 方法初始化成功之后, setOption 设置notMerge为true报错 [echarts]

[via GitHub]

ljgx opened a new issue, #21129:
URL: https://github.com/apache/echarts/issues/21129

   ### Version
   
   5.3.3
   
   ### Link to Minimal Reproduction
   
   https://github.com/ecomfe/echarts-for-weixin/issues/962
   
   ### Steps to Reproduce
   
   报错内容
   
   <img width="606" height="230" alt="Image" 
src="https://github.com/user-attachments/assets/b8a65678-9adb-48af-bdc7-c1faa4124322";
 />
   
   wxml
   ```
   <button bind:tap="setChartData">改变图表参数</button>
   <view class="chart-fa-view">
     <ec-canvas id="mychart-dom-line" canvas-id="mychart-line" ec="{{ ec 
}}"></ec-canvas>
   </view>
   ```
   
   wxss
   ```
   .chart-fa-view {
     width: 100%;
     height: 566rpx;
   }
   #mychart-dom-line {
     width: 100%;
     height: 566rpx;
   }
   ```
   js
   ```
   import * as echarts from "../../ec-canvas/echarts";
   
   const app = getApp();
   let customChart = null;
   function initChart(canvas, width, height, dpr) {
     const chart = echarts.init(canvas, null, {
       width: width,
       height: height,
       devicePixelRatio: dpr, // new
     });
     canvas.setChart(chart);
   
     var option = {
       title: {
         text: "测试下面legend的红色区域不应被裁剪",
         left: "center",
       },
       legend: {
         data: ["A", "B", "C"],
         top: 50,
         left: "center",
         backgroundColor: "red",
         z: 100,
       },
       grid: {
         containLabel: true,
       },
       tooltip: {
         show: true,
         trigger: "axis",
       },
       xAxis: {
         type: "category",
         boundaryGap: false,
         axisTick: {
           show: false,
         },
         axisLabel: {
           color: "#86909C",
         },
         // show: false
       },
       yAxis: {
         x: "center",
         name: "",
         type: "value",
         splitLine: {
           lineStyle: {
             color: "#ccc",
             type: "dashed",
           },
         },
         // show: false
       },
       dataset: {
         source: [
           ["时间", "A", "B"],
           ["周一", 43.3, 85.8],
           ["周二", 83.1, 73.4],
           ["周三", 86.4, 65.2],
           ["周四", 72.4, 53.9],
         ],
       },
       series: [
         {
           name: "A",
           type: "line",
           smooth: true,
         },
         {
           name: "B",
           type: "line",
           smooth: true,
         },
       ],
     };
     chart.setOption(option);
     customChart = chart;
     return chart;
   }
   function getSeries(val) {
     if (val % 2 === 0) {
       return [
         {
           name: "A",
           type: "line",
           smooth: true,
         },
         {
           name: "B",
           type: "line",
           smooth: true,
         },
       ];
     }
     return [
       {
         name: "C",
         type: "line",
         smooth: true,
       },
     ];
   }
   function getData(val) {
     if (val % 2 === 0) {
       return [
         ["时间", "A", "B"],
         ["周一", 43.3, 85.8],
         ["周二", 83.1, 73.4],
         ["周三", 86.4, 65.2],
         ["周四", 72.4, 53.9],
       ];
     }
     return [
       ["时间", "C"],
       ["周一", 90],
       ["周二", 78],
       ["周三", 51],
       ["周四", 12],
     ];
   }
   
   Page({
     onShareAppMessage: function (res) {
       return {
         title: "ECharts 可以在微信小程序中使用啦！",
         path: "/pages/index/index",
         success: function () {},
         fail: function () {},
       };
     },
     data: {
       ec: {
         onInit: initChart,
       },
       a: 0,
     },
   
     onReady() {},
     setChartData() {
       this.data.a++;
       customChart.setOption(
         {
           series: getSeries(this.data.a),
           dataset: {
             source: getData(this.data.a),
           },
         },
         true
       );
     },
   });
   ```
   
   ### Current Behavior
   
   当图表需要更换 series ,setOption 之后,图表会带上没更换之前的 serises  我setOption  设置notMerge 直接报错
   
   ### Expected Behavior
   
   设置 notMerge不报错
   
   ### Environment
   
   ```markdown
   - OS:
   - Browser:
   - Framework:
   ```
   
   ### Any additional comments?
   
   _No response_


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