Window management between two processes in Linux

Hello,

We are running a Unity3D application on Fedora 28. We start X window first (by running X&)

The application has two processes, proc1 and proc2. Both processes has a visible window scene. We start proc1 first, then launch proc2 from proc1. We expect when process2 start, the process2 window become active and stay in front, scene of process2 should hide.

The problem is when proc2 starts, the proc1 window will stay in front and proc2 window never gets to front.
Can you point me how to fix the issue?


Also another test we did: if we start gnome (by running: startx), the problem will not happen

 

Ok, problem resolved