How can I prevent Gnome from showing two windows when doing alt-tab? (c++ qt app)

Question

(see edits)

I'm developing a QT/c++ application under gnome.

The application a main window and QListBox child window.

Both of these windows show up as separate main windows when I alt-tab away from the application.

How can I make it so that only one window is shown when I (or later the user) uses alt-tab?

I am guessing this behavior comes because one main window doesn't clip the subwindow - the subwindow extends the boundary of the main window. Gnome has bad alt-tab behavior for a number of other applications too, showing modal dialog boxes separately from main windows. But in the case of my app, this is really annoying.

I am thinking I could make a giant transparent window that includes both existing windows. But it would be nicer to find a "clean" solution.

(the most logical guess is indeed that it has something to do with window flags. I've tried every reasonable combination of flags I could think of. The window types are described here)

Edit: The app has a QWidget as its main window (Not QMainWindow), QListView is contained in the QWidget object and created by passing a point to the main window. is styled with Qt::Tool | Qt::FramelessWindowHint.

Edit2: The Qt::X11BypassWindowManagerHint style does work to remove the window from the alt-tab list. The problem is that it also makes the window "unmanaged" so it cover the other windows. I could manaully hide whenever I lose focus - prize now for a better solution.

Answer 1

You can try it by hand with the wmctrl tool. With "-r -b SOMETHING" you can modify NET_WM arguments to it. Try these in [1].

If this works, you can add them in with Xlib-Calls (If you get to know X11 Window Number from Qt. I am sure that's possible).

[1] http://standards.freedesktop.org/wm-spec/1.3/ar01s05.html