I have a Qt application with borderless window. So, I am creating my application window with CreateWindow() and then I have QWidget which uses the HWND. Everything works fine, except that when the application is maximized and the Windows taskbar is set to auto-hide. In that case, if I click on the application icon, the program is not minimized. Even stranger is the fact that this only happens if the application is on my primary monitor. If it's on another monitor, everything works fine. Or, if the taskbar is not set to auto-hide, everything works fine on any monitor. When the taskbar is set to auto-hide, on my primary screen the taskbar wasn't even showing up, so I am showing it with ShowWindow(hTaskbar, SW_SHOW). When it shows up, everything works when I click on the icons of other applications, so there must be something wrong with mine, but I am not sure where to start.
CreateWindow()? What messages are you processing in your window procedure? Could you post a minimal example that reproduces the issue? This is a strange issue indeed... – andlabs