Loss of expression on accidental press of Up arrow

Originally reported on Google Code with ID 433

Steps to reproduce:
- Type an expression
- Press Up arrow (make sure you have some history)
- Press Down arrow again

Expected behavior:
- The original expression should be restored

Experienced behavior:
- Original expression is completely lost

Product version:
0.10.1

Operating system:
Mac OS X Mountain Lion

Additional Information:
While trying to use Left/Right arrow to move the cursor around, I am accidentally ending
up pressing the Up arrow and losing the changes.

Reported by haridara on 2013-03-10 18:02:52

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