QIntVadator can't work with sequence length

Scenario:

1. Open 2GbSeq.fa (more than 2^31 bases long).
2. Click Ctrl + I (Insert subsequence)
3. Expected: position to insert = 1
4. Insert "T" in the "Paste data here" field
5. Press OK
   Expected state: T is inserted in the position 1
   Actual state: Error: Incorrect position to insert, should be from 1 to 2147483666