Cannot select entire screen

[Fogapod]

Summary

When I try to select the entire screen, the result is 1 pixel off in both dimensions.
This looks like a bug in xclip because when I select entire screen using maim screenshotting tool, resulting image has correct dimensions.

Excpected result

2560x1440+0+0 (2k screen)

Actual result

2559x1439+0+0

[digitronik]

Interesting thanks for issue @Fogapod
with first look; I think it's not bug in xclip but looks like line width is responsible for this.