Example 40 arrow not in the right place

[yousifyaqeen]

Hello ,

in example 40_ui ,when scalable, no scrollbar and scale Left check buttons are checked in the same time, the arrow for scaling the window doesn't show in the right place , border check button doesn't seem to affect this problem .

on ubuntu mint 18.04 , using clang version 6.0.1 .

[jube]

gf uses nuklear, I will check if the bug is present in nuklear and open an issue there.