Ctrl Z on description

[Chris Wardle]

When I am writing a description on an issue and I hit ctrl z to undo a recent action, the page automatically scrolls me to the bottom of the description. This is problematic when writing long descriptions as it is difficult to see whether my recent action has been undone and I lose the location of my change. 

Please can this be fixed so that when I hit ctrl z, I would expect the description to not scroll to the bottom but it should remain at the same point I am currently viewing and therefore I should be able to see the change.