Created attachment 327876 [details] Picture showing a "phantom" composited window frame, where the frame is composited, but no window is shown. Description of problem: Some QT4/KDE4 applications that make use of the notification-area (such as Amarok), while used in GNOME with Metacity as the composite-manger, and composite enabled, there is a "composited frame" with the drop shadow of an "invisible window" (screenshot) Version-Release number of selected component (if applicable): metacity-2.24.0-2.fc10.x86_64 nodoka-metacity-theme-0.3.90-2.fc10.noarch qt-x11-4.4.3-6.fc10.x86_64 qt-4.4.3-6.fc10.x86_64 How reproducible: Always Steps to Reproduce: 1. Start a GNOME session, install gconf-editor. 2. Enable Metacity as the compositor. 3. Start a KDE4 application that makes use of the notification-area (like Amarok) Actual results: There is an area that a window would take up which is drawn composited, though there is no window frame (see screenshot) Expected results: The desktop to remain clean when a window frame is not meant to be shown (not composited).
We don't support the metacity compositing manager; there's no UI to enable it and we don't see it as being an interesting long-term direction for compositing; if it still happens with F12 you might want to file a bug against Metacity upstream.