steam - bakkeby/patches GitHub Wiki
Steam, and steam windows (games), trigger a ConfigureNotify request every time the window gets focus. More so, the configure event passed along from Steam tends to have the wrong x and y co-ordinates which can make the window, if floating, jump around the screen.
This patch works around this age-old issue by ignoring the x and y co-ordinates for ConfigureNotify requests relating to Steam windows.