QDoubleSpinBox with prefix cause text input to fail when text is selected

I found two cases when using the QDoubleSpinBox with a prefix set ($ in my case) the text input cursor is placed in the wrong spot. In the first case if you triple click to select all text or select the text from left to right with the mouse then try and input a number with the keyboard the first digit overwrites the selected text but the input cursor it place between the prefix and the digit just inputed.

The second case is when you select the text from right to left. When you input a number with the keyboard the text is not replaced and the input cursor is place after the prefix but before the digits. So the new digit get inserted at the front of the number. If the number already was using all digits then nothing will happen.

I have attacked a ui file that you can load into designer and preview it. The follow the direction on the screen to see what I am talking about..