Info panel shows a lot of measures, such as X, Y position of the cursor, and also, when you drag to make a selection or create a box or similar, the Width, Height, Diagonal and Angle.
X,Y position are shown in the correct selected unit, that is milimeters, inches, points, etc. But W,H and D are shown always in pixels.
I think it is a bug. The diagonal value can be useful to get the distance in mm, inches, etc... between two points on an image.
I would like this bug to be corrected when possible.