Some icons fail to appear when "displaying unpinned apps only from current workspace"

[pawel-tarasiuk]

When unpinned apps are set to be shown only when they match the current workspace, some of them fail to show at all. Apparently, Dock.window_added can be called before wnck can tell that the window exists and which workspace is it assigned to.

One possible, yet terribly dirty fix is to make DockedApp.has_windows_on_workspace broader, so it matches not only "windows assigned to wnck_workspace" but "windows that are not assigned to any other workspace" as well. However, I hope that this issue can be resolved in some more fitted way, as this (not-really-a-)suggestion is likely to break some other cases.

`

def has_windows_on_workspace(self, wnck_workspace):
    """ test whether the app has at least one window open on a specified
        workspace

    Args:
        wnck_workspace - the workspace to check for

    Returns:
        boolean
    """

    other = False

    for win in self.get_windows():
        wnck_win = Wnck.Window.get(win.get_xid())
        if wnck_win is not None:
            win_ws = wnck_win.get_workspace()
            if win_ws == wnck_workspace:
                return True
            else:
                other = True

    return not other

`