Plank dock has an offset from the screen edge by default

[Yusuf Mohammed Habeeb]

Hi,

I am using Plank 0.11.0
the linux distribution I am using is: ubuntu 15.10
with the default unity user interface

My laptop is lenovo y-50 with a Hi-DPI screen, current resolution is 3840 x 2160, and it has a nvidia GEFORCE GTX video card, I am using nvidia binary driver version 352.63.

installed plank from a repository provided by noobslab.com

the problem I am facing is that the dock has an offset from the screen edge by default, the offset is like 1 pixel height but it still preventing the dock from showing up when using it in any hide mode because of the gap between the dock and the screen border, the offset only appears when placing the dock at the bottom or at the right side, while when placed to the left or top sides -which is not usable in unity because of the launcher and the top panel- the dock seems to be displaced further into the right side or to the top.

The attached screenshot does not help a lot in explaining the problem, but as you can see in it, the dock shows no reaction although the mouse is placed on the right edge of the screen, this happens when the dock is on the bottom too, but it does not happen when it is on the right or the top sides.

the problem persists no matter what options are changed (Themes, icon size, zoom option, alignment... etc). tried changing the screen resolution with no luck either.

please ask if any additional information is required.

Thanks and sorry for any mistakes, English is not my native language