The TopMost(bool) function sets or resets the x11 attribute for a window that can stay on top of all the others.

Here's the fix for the Eye Care example for linux folks.

void EyeCare::Sync()
{
#ifdef PLATFORM_WIN32
	ExStyle(config.topmost ? GetExStyle() | WS_EX_TOPMOST
	                       : GetExStyle() & ~WS_EX_TOPMOST);
  // -rs add these two lines
#else
	config.topmost ? TopMost(true) : TopMost(false);
#endif
	trayicon.Icon(ignore ? EyeCareImg::off() : EyeCareImg::icon());
	if(config.hideicon)
		ignore = false;
	trayicon.Show(!config.hideicon);
	Restart();
}