i have a very strange case which i cannot reproduce on the fiddle and am wondering if anyone had such an issue. I am using extjs 5 nightly from 20151109, the browser in which this occurs is firefox 42.
I have a locked grid with multiple columns. After each grid.view.refresh (doesn't matter if it is the normal or locked or main grid refresh) the header of the columns gains 2px. After multiple refreshes the grid looks like on the attached picture.


If I change the grid to a non-locked one, the problem is gone. The problem is also visible on a locked treegrid.

If someone had a similar problem and has a solution I would be really grateful.

Thank you for help.