One-line fix for TextInput controls, to change the color of cursor whenever element's RCSS style changes the text color. Currently, changing the text color of the widget via RCSS (hover, active, focus, etc.) does not change the color of the cursor. In other words, if the input.text RCSS style says color is white, then then cursor of that element will forever be white, even if the input.text:focus (or any other style) changes the appearance of the control. The performance hit from doing this will be negligent.