1. "Priority" combobox renders icons and text too close together. The "blocker" icon and text look like they overlap one pixel.
2. There is non-clickable space between the Component combo-box arrow and the border that surrounds the text field. I expect there to be no space.
3. I am not sure I like the new Component combo-box as input. Specifically, I am concerned that selecting and deselecting multiple items is slower. I cannot select multiple components at once (I have to open the combo-box multiple times) and clicking the tiny "x" one at a time is also very slow. The old approach was very keyboard friendly.
4. If you decide to keep the current combo-box approach I suggest changing the combo-box into a "+" arrow since the box only adds items, not replace the existing values.