Display warning when entering "-" for unsigned numeric types in table view. Reproducible: Always Steps to Reproduce: 1. In an already inserted record, start editing value (e.g. press F2) in a field of unsigned integer type. 2. Enter some negative number, e.g. -123 3. Press Enter to accept Actual Results: The value disappears silently. Expected Results: It should not be possible to enter the minus sign. - In the same time, warning popup should appear like presented at http://www.kexi-project.org/pics/2.6/kexi-2.6-text-trimming-in-forms.png User could even overlook that the value is not entered.