pa7-sigma opened a new issue, #20625:
URL: https://github.com/apache/echarts/issues/20625

   ### What problem does this feature solve?
   
   ### Use case
   I'd like to mute other marks when an individual or multiple marks are 
selected to visually distinguish selected & unselected marks more prominently.
   While there is a select customization state, there is no way to customize 
the unselected slices during selection.
   
   ### Example Experience
   
   
https://github.com/user-attachments/assets/f7fe70c9-acb7-4a69-9b0b-f00134a301ae
   
   ### Current Workaround
   - dispatch select action to trigger the select state & styles
   - after dispatching customize styles through accessing the graphics elements 
on the next tick (w/ requestAnimationFrame)
   
   Initially I tried a combination of dispatching highlight & select to show 
the emphasis state for selected marks however as soon as I hovered over a 
different mark the selected mark would no longer be emphasized.
   
   ### Open Questions 
   
   Is there a better way to do this without customizing on the renderer level?
   
   If no, is there an API to know when a dispatched action has been applied 
internally? I have not found any and 
   listening for the last `rendered` or `finished` event after dispatching an 
action turned out to not be feasible as the render delay was to long. Directly 
applying style customizations after dispatching the action (without waiting for 
the next tick) expectedly led to render inconsistencies 
   
   ### What does the proposed API look like?
   
   I can think of 2 ways to surface this:
   
   1. Apply blur styles on marks that are not selected when selection happens
   2. Introduce a new `unselect` state supporting an `itemStyle` configuration 
that would be applied to items that are not selected during selection
   
   1 would be a breaking change so probably not feasible, 2 would be additive 
but expand the API surface


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