When you change the contour wrap it does not show in real time. This can mean going to and from the dialog multiple times until you get something looking the way you want.
Shown here: https://youtu.be/w6Qcl-w7s5c?t=2m55s
Older version but still applies.
Works as designed, so not a bug. Perhaps an enhancement request, but I am not sure to like it. Too resource consuming and very annoying if the layout must be updated each time you type a number in this dialog.
Best regards. JBF
Well, I like the idea and it will be a fun challenge for devs to make it performant ;)
As the image properties dialog is modal, it cant affect the underlying document when you make changes to it. What is needed is an 'Apply' button so you can see the changes without leaving the dialog.
*** This bug has been marked as a duplicate of bug 37336 ***