[Feature] [LineChart] 希望添加 symbolSize 配置以及将select 样式权重设置高于emphasis样式

[RootJian]

What problem does this feature solve?

1. echarts symbolSize 设置6和emphasis.scale为true时，放大效果不明显，希望能够提供配置手动设置放大像素值
   Demo
2. 当我设置select.itemStyle 样式和emphasis.itemStyle样式时，hover 点击symbol，此时没有显示select的样式，而是展示的emphasis样式，需要失焦symbol后才展示，因此希望select.itemStyle权重能够大于emphasis.itemStyle或者将其进行merge,合并样式更佳

What does the proposed API look like?

1、
{ symbolSize: 6, emphasis:{ symbolSize: 8 } }

[echarts-bot]

@RootJian It seems you are not using English, I've helped translate the content automatically. To make your issue understood by more people and get helped, we'd like to suggest using English next time. 🤗

TRANSLATED

TITLE

[Feature] [LineChart] wants to add a symbolSize configuration and set the select style weight higher than the emphasis style

BODY

What problem does this feature solve?

1. When echarts symbolSize is set to 6 and emphasis.scale is true, the amplification effect is not obvious. Hopefully, you can provide configuration to manually set the magnification pixel value
   [Demo](https://echarts.apache.org/examples/zh/editor.html?c=line-simple&code= PYBwLglsB2AEC8sDeAoWsAeBBDEDOAXMmurGAJ4gCmRA5AMYCGYVA5sAE7m0A0J6AE2aMiAbVoBZGL1i0AKgFcqM2gHUqAlXIAWClQDEOEFQGVmphdFoBdEgF8-6cjnxFUpMpRqyAbowA2SrT2jrB4VEZUhLCi_ MQegsJiAIwArAAMPLAATADMmTnZACxZ2ckAHFnJualVRQDspQBs6dahHhTUdP4Q0MrtpHjkALYARsD-JhAAXt5NA-hUwyDajHiu7gnoeEz-NGAcSnHodsewcafotnYA3EA)
2. When I set the select.itemStyle style and the example.itemStyle style, hover click on the synchronization, at this time there is no display of the select style, but the display of the embodiment style, which needs to be shown after the out-of-focus symbol, so I hope that the select.itemStyle weight can be greater than the example.itemStyle or compare it. Merging styles is better

What does the proposed API look like?

1、
{ symbolSize: 6, emphasis:{ symbolSize: 8 } }

[plainheart]

希望能够提供配置手动设置放大像素值

从 v5.3.2 开始，symbol 的 emphasis.scale 支持数值类型，参见 #16688。文档可能有疏漏，仅 scatter series 有注明。示例

[RootJian]

希望能够提供配置手动设置放大像素值

从 v5.3.2 开始，symbol 的 emphasis.scale 支持数值类型，参见 #16688。文档可能有疏漏，仅 scatter series 有注明。示例

确实能生效，那还有一个就是select.itemStyle 样式和emphasis.itemStyle样式同时设置的问题，请问有解决方案吗 Demo

select样式：

hover样式：

期望hover时取click样式（同时hover放大效果保留）

但现在hover时click样式依然保留的hover样式

[RootJian]

希望能够提供配置手动设置放大像素值

从 v5.3.2 开始，symbol 的 emphasis.scale 支持数值类型，参见 #16688。文档可能有疏漏，仅 scatter series 有注明。示例

ts 声明提示echarts.LineSeriesOption scale为boolean

[plainheart]

似乎是漏掉了，欢迎 PR 或者等后面我们加一下~