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echarts tooltip is covered by canvas on iOS13

See original GitHub issue

Version

4.3.0

Steps to reproduce

option ={
                        grid:{
                            top:'20%',
                            bottom:0,
                            right:'5%',
                            left:'0',
                            containLabel:true,
                        },
                        tooltip: {
                            trigger: 'axis',
                            confine:true,
                        },
                        xAxis: {
                            type: 'category',
                        },
                        yAxis:{
                            name:'元/吨',
                            min:'dataMin',
                        },
                        dataset:{
                            dimensions:['日期','采购价'],
                            source:[
                                {'日期':'2019-01-02','采购价':100},
                                {'日期':'2019-01-05','采购价':400}
                            ]
                        },
                        series: {
                            type:'line',
                            smooth:true,
                            symbol: 'circle',
                            symbolSize:2,
                            sampling: 'average',
                            connectNulls:true,
                            label:{
                              // show:true
                            },
                            itemStyle: {
                                color: '#ffc858'
                            },
                            lineStyle:{
                                width:1
                            },
                            areaStyle: {
                                color: new echarts.graphic.LinearGradient(
                                    0, 0, 0, 1,
                                    [
                                        {offset: 0, color: '#ffc858'},
                                        {offset: 1, color: 'rgba(255,200,88,0)'}
                                    ]
                                )
                            }
                        },
                    }