revintec commented on issue #20731:
URL: https://github.com/apache/echarts/issues/20731#issuecomment-2645578193

   > 
[Here](https://echarts.apache.org/examples/en/editor.html?c=line-simple&code=PYBwLglsB2AEC8sDeAoWsAeBBDEDOAXMmurGAJ4gCmRA5AMYCGYVA5sAE7m0A0J6AE2aMiAbVoBZGL1i0AKgFcqM2gHUqAlXIAWClQDEOEFQGVmphdFoBdEgF8-6cjnxEkDkgBs2VaALce6GDAwJ6QIG5kRqysVBx0jLh4tLCBsHhxEFSEsKL8xKSk0IwAtjSyAIy8-YLCYhUArAAMPLAATADMLe1tACytbRUAHK0VHQ2jvQDsAwBsTdaOhWSU5bSeENDK-WnoqMuwxWV0bdUHQmAiuZ3dbX0Dw6PjkzPt86PNizUr1HQbW7Qdks9t8jmsOmdlhcrqI7v12o9YGMJkjpnNuo1bl0vgcKL9ZP9toU7CRbHYANwoKn0GB4MCwARUABmjAUYQA-jTPJw8AhcrQAMQNaZNeizFQCgCcFXo9CmDQlLPoQwaQwlVCosy14tagqmHXoTUZEo6ACNGG0pqddQKmcreg1rbIpYx5qbeurGFNZfQbJSadA6bBvLE_OyMt56GBw5cWHykEiiGAOEoBkmU1RWh100pUpSSuQAMLaRgcMAAOhgAAp1j4_BGqFH6CXoLFNK0mZYo1BoFWQKXSngAJQFYN1gThqiR6N05hUUT9jiD8tg6x8gCEId8E4bUZjc4XA5KeBXpSo1kp6BIAaDu5YAnjJPQN_pGSM2XZoEgMD5ogv19pektzDaFf3_Z9APSTIPzBXlEAAeVNAArRsKwAayocg8CrYCdynVD9xYIdL1gJlOFgHCqHpTZGQwWBNig988HZWCR32UgX0OM8-TfLJmNg0QaKoDBwI4yDTRCTw-Vwydp0I-dVxIiDA3pLlyMQRkWTZaM1I4PBBL8YTRPQO8NFEVc-WTJQlNgfIICZCj1wk0I2O-XiPy_HtyxABQ8G0KskDBIgwVaPB
 
yBKCTPDoaAYGUVpCRMChvEiXS6GTRhA0XXwwBSOw7GI74ZOhbzfP89iDiCriymBZYIBYEpEvIZLkFgVKCQgVhtDAVgOEwmRQEYeg6vIIgmnLWZUhqwoEqS8oEza9YOq6nq-taAahooUbxtSb58psq9iVgKcMlHQp3OYzyYBKvyAsqkL0nCyK6CoEpwCLCAOHobwZBmpq5ta0JOCIXTUj2wrx3ZYqfJu8rljus8ptIOqXsa5r5sB-IAe5Dg1v7DaRqx8jdmWX60cJzHdNxwbhuBjGdoOMHiXsEgSALYtSwrDIwHg8AewC_JcMiUz_Cg6cNFaaEiCK4RJvyc6iHOz9eZgewhxQPagA)
 is another possible workaround which takes advantage of echarts standard 
formatters by only modifying the visuals of legend items and series. The basic 
idea is to keep track of the state of selected series yourself and set the 
echarts legends items always to selected state after a change event. Based on 
your own state, series color is set to transparent and legend color to grey.
   
   thanks for that, this is a great workaround, though hacky, it solves all the 
problems, and no data layout issues
   still, hope echarts will someday have these features builtin, so we could 
write less code :P


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