ToolButton pads the contexts of the label+icon based on the desktop theme's svg margins. Causing the icon to only be 12px, which is scaled down and looks like a solid square with the breeze icon, as seen in D4751 comments. We want this button to be reasonably small, but should have the minimum of a 16px icon. The button itself is 18px atm. Since the icon doesn't go right to the edge, we can just overlay the icon on top of the button and apply all the ToolButtonStyle effects.