100pah opened a new pull request #12050: fix: enable `dispatchAction` highlight 
downplay for treemap. fix #9816.
URL: https://github.com/apache/incubator-echarts/pull/12050
 
 
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   ## Brief Information
   
   This pull request is in the type of:
   
   - [x] bug fixing
   - [ ] new feature
   - [ ] others
   
   
   
   ### What does this PR do?
   
   fix: enable `dispatchAction` highlight downplay for treemap. 
   
   
   
   ### Fixed issues
   
   fix #9816.
   
   ## Details
   
   ### Before: What was the problem?
   
   Can not `dispatchAction` highlight downplay for treemap. 
   
   
   ### After: How is it fixed in this PR?
   
   Enabled.
   
   
   ### Related test cases or examples to use the new APIs
   
   `test/treemap-disk2.html`
   
   
   
   ## Others
   
   
   ### Remain issue
   
   
   Whether highlight/downplay will effect all the subtree or only the hovered 
node?
   There are both scenarios, depending on the styles the treemap used. For 
example,
   a treemap uses border to distinguish the highlighted subtree, we should only
   highlight the target node rather than the entire subtree. Otherwise the all 
of the
   border inner the subtree will be highlighted unexpectedly. If a treemap uses 
area
   color to distinguish the highlighted subtree, the entire subtree needed to be
   highlighted.
   
   But I only support "highlight single node" here. Because based on the current
   mechanism, implement "highlight entire subtree" need some more code, a little
   like `focusNodeAdjacency` in `graph series`, and event more complicated 
because
   the zrender elements in treemap are nested so we need to consider a mouse 
over
   listener should/should not listen to its descendent.
   
   

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