Issue Report: Steam tooltip and menu don't handle focus correctly

[VoidStar]

I'm currently using Kwin. Hovering my mouse on achievements on a game view raise the window and menu and tooltips make the window onfocused when appearing, even if steam thinks it's focused (according to the "decoration" style)

on Kwin with dim inactive effect (which is enabled by default) we can see the window flickering.

Without the dim inactive effect we can see the selection changing rapidly in the task manager (window taskbar)

[VoidStar]

posted to github: https://github.com/ValveSoftware/steam-for-linux/issues/1050