Code review comment for lp://qastaging/~sinabakh/ubuntu-calculator-app/history-using-arrow-keys

Thanks. Nice improvement.

Unfortunately it is causing lost of last typed formula.
Steps to reproduce:
1. Create several entries in calculation history
2. Type some formula: 25*25
2. Press up key (the previous calculation will appear)
3. Press down key

Currently:
- Empty formula is shown

Expected:
- 25*25 should be shown