zyjwsg opened a new issue #11610: an issue of scroll type's legend
URL: https://github.com/apache/incubator-echarts/issues/11610
 
 
   ### Version
   4.3.0
   
   ### Steps to reproduce
   1. get enough legends to show pagination, suggest making a 2 or 3 pages 
legends
   2. scroll to last page
   3. keep zooming in window, until pagination disappear
   
   then you can see the issue: the pagination disappeared ! and only shows the 
last page of legends, parts of legends disappeared as well!
   
   ### What is expected?
   correct pagination and correct legends are expected.
   
   ### What is actually happening?
   pagination disappeared, parts of legends disappeared.
   
   ---
   According to my observation, legends pagination disappeared when there is 
enough space to show all legends,  but current page number was not been 
re-calculate and legends were not been repaint during calculating space
   
   ### Sample
   this is from official demo: 
[pie-legend](https://echarts.apache.org/examples/zh/editor.html?c=pie-legend), 
i changed legends count from 50 to 20, for easier test this issue
   
![image](https://user-images.githubusercontent.com/7666606/68482658-01a15180-0275-11ea-8842-5dd30312f64d.png)
   
   while i kept zooming in window, pagination dissapeared:
   
![image](https://user-images.githubusercontent.com/7666606/68482739-28f81e80-0275-11ea-9f67-f0032f783b11.png)
   
   
   <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE -->
   <!-- This issue is in English. DO NOT REMOVE -->

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