When a negative numeric value is in a spinner and you make double click to select the value and change it, the "-" symbol is not selected. That creates a lot of problems: Let's say if you want to change "-5" to "-10" you double click on the "-5" but ONLY the "5" is selected. Then when you write "-10" the content of the box is "--10" which makes an error and the value doesn't change. If you want to change to a positive number is bad too, because you double click on the number but only the "5" gets selected. Then you write your new positive value, like "10" but the final value on the box is "-10". This is so so annoying... Probably is Microsoft's fault.