Bug 360373

If I have downloaded a file and wish to amend the file name, by adding a prefix, the first letter is positioned correctly, but then the cursor jumps to the endpoint of the existing file name.
If this is not noticed, an incorrect name is used, and the extension is unrecognised.


Reproducible: Always

Steps to Reproduce:
1.Download a file.
2.Start to add a prefix, say a KMM account name before the existing name, which possibly is a date.
3.Original filename say is 2016.csv.
4. Enter the first letter, say 'C' of Current.
5. Now add the second letter, the 'u'.
6. This, and subsequent letters, are added after the file extension.
7. The name becomes C2016.csv.urrent.



Actual Results:  
As above.

Expected Results:  
Filename should be Current2016.csv.

Interestingly, if the error is noticed, and the added first letter is backspaced over, the wanted prefix can now be added correctly.