firefox zoom chart

REQUIRED INFORMATION Ext version tested:

• 4.1

Browser versions tested against:

• firefox 16

DOCTYPE tested against:

• ____

Description:

• 
  broken chart bars

Steps to reproduce the problem:

• 
  1. open http://dev.sencha.com/deploy/ext-4.1...harts/Bar.html
  2. browser menu > view > zoom > zoom in. Or ctrl+mouse wheele up rotate
  3. mouse hover on green rects

The result that was expected:
The result that occurs instead:
invalid size and offset see screenshot:

We don't actually support browser zooming