Wrong Z-index of load mask after expand panel

1. 
   

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2. 
   
   
   

   
   

   
   

   Wrong Z-index of load mask after expand panel

   
   

   
   

   Wrong Z-index of load mask after expand panel

   
   
   
   

   
   

   Ext version:
   
   Browser:
   

   
   
   • Chrome Version 40.0.2214.115 m
   
   

   
   
   
   Steps to reproduce:
   

   
   
   1. Open - http://ift.tt/1DyGZFu
   
   
   2. Select Framework ExtJS 4.2.1.883 Classic and run the fiddle.
   
   
   3. Click header of the collapsed "West" panel to float it.
   
   
   4. Click arrow of the placeholder to expand it.
   
   

   
   Expected behavior:
   
   Load mask disappears after loading.
   

   Actual behavior:
   
   Load mask will hang there and never disappear.

   
   Capture.PNG
   
   Note:
   
   It is working good with ExtJS 5.1.0.107 Classic selected.

   
   

   
   

   
   

   
   

   
   
   
   

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Wrong Z-index of load mask after expand panel