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### One-line summary [问题简述]

Incorrect value axis scale calculation in case of stack bar



### Version & Environment [版本及环境]
+ ECharts version [ECharts 版本]:
+ Browser version [浏览器类型和版本]:
+ OS Version [操作系统类型和版本]:





### Expected behaviour [期望结果]

In the below provided example, value axis max value should be less than 3.



### ECharts option [ECharts配置项]
<!-- Copy and paste your 'echarts option' here. -->
<!-- [下方贴你的option,注意不要删掉下方 ```javascript 和 尾部的 ``` 字样。最好是我们能够直接运行的 
option。如何得到能运行的 option 参见上方的 guidelines for contributing] -->
```javascript
app.title = '坐标轴刻度与标签对齐';

option = {
    tooltip : {
        trigger: 'axis',
        axisPointer : {            // 坐标轴指示器,坐标轴触发有效
            type : 'shadow'        // 默认为直线,可选为:'line' | 'shadow'
        }
    },
    grid: {
        left: '3%',
        right: '4%',
        bottom: '3%',
        containLabel: true
    },
    xAxis : [
        {
            type : 'category',
            data : ['Mon', 'Tue', 'Wed'],
            axisTick: {
                alignWithLabel: true
            }
        }
    ],
    yAxis : [
        {
            type : 'value'
        }
    ],
    series : [
        {
            name:'直接访问',
            type:'bar',
            stack:'a',
            barWidth: '60%',
            data:[[1,1]]
        },
         {
            name:'直接访问',
            type:'bar',
            stack:'a',
            barWidth: '60%',
            data:[[0,1]]
        },
         {
            name:'直接访问',
            type:'bar',
            stack:'a',
            barWidth: '60%',
            data:[[2,1]]
        },
         {
            name:'直接访问',
            type:'bar',
            stack:'a',
            barWidth: '60%',
            data:[[2,1]]
        }
    ],
};


```




### Other comments [其他信息]
<!-- For example: Screenshot or Online demo -->
<!-- [例如,截图或线上实例 (JSFiddle/JSBin/Codepen)] -->



[ Full content available at: 
https://github.com/apache/incubator-echarts/issues/8980 ]
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