Changing Validators can prevent use of delete/backspace

1. Run the attached .qml
2. Click the DoubleValidator, which has a top of 31
3. Enter 30.5 into the field
4. Select the IntValidator, which has a top of 30
5. Press backspace to remove the 5 (which would make the validator technically valid)

Bug: Cannot remove the text.

Also occurs if there is no validator and a number like 333 exists - as 33 > 30 it will not allow the deletion of the last 3. A validator should not prevent the use of a backspace/delete.