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While viewing a pdf when we open and resize a thumbnail panel by sliding the resizer. Sometimes the cross button is not clickable. That usually happens when we quickly slide the resizer and the main container doesn't resize properly and the thumbnail window overlaps the main container as you can see in the picture.
Picture1: The cross button is clickable when the resizing is done normally.

Picture 2: The cross button is not clickable when thumbnail panel overlaps main container

Kindly resolve the bug.