Tree grid bug

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2. 
   
   
   

   
   

   
   

   Tree grid bug

   
   

   
   

   Tree grid bug

   
   
   
   

   
   

   Just look this screencast. I don't know how to explain it better
   

   http://ift.tt/1z11igC

   
   

   Ext.versions.extjs = "5.1.0.107"
   
   mac os 10.10.2, chrome latest

   
   

   
   

   
   

   
   

   
   

   
   
   
   

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Tree grid bug