Version:           4.5 (using KDE 4.5.4) 
OS:                Linux

When in the splits window, tabbing into the amount field overwrites the contents of the clipboard.

Reproducible: Always

Steps to Reproduce:
* Open the splits window on a new transaction.
* Enter a category/account in the category field.
* Enter a text string in the memo field.
* Copy that string to the clipboard using the keyboard copy shortcut.
* Tab to the value field and enter a value.
* Confirm the split.
* Begin a second split line, entering a category/account in the category line.
* In the memo field, paste the clipboard contents using the keyboard paste shortcut.

Actual Results:  
The initial amount in the value field from the prior split is pasted.

Expected Results:  
The text copied from the memo field from the prior split should be pasted.

It would seem to me, by observation, that the application is using the clipboard to temporarily store the contents of the value field to be automatically pasted into the calculator application should the user press the calculator button.  Although this is a good idea, the application does not appear to restore the old clipboard contents.  The code should be modified such that the old clipboard contents are saved while the value field has focus, and are restored either when the paste is performed in the calculator application, or when the value field loses focus to something other than the calculator button.