Replacing Metacity with XFCE's xfwm4

Comments:

I found the following Ubuntu-specific pages with information about replacing Metacity with XFCE's xfwm4:

• http://doc.gwos.org/index.php/Xfwm4
• http://ubuntuforums.org/showthread.php?t=88393

Note that the Ubuntu instructions don't quite work for Debian because of Debian's customized /usr/bin/gnome-wm. On Fedora Core 6, GNOME doesn't seem to acknowledge the $WINDOW_MANAGER env var, so it's necessary to use gconf: gconftool-2 --type string --set /apps/gnome-session/rh/window_manager /usr/bin/xfwm4

Update 2007-06-05: It looks like those pages don't say how to turn on the Composite extension in X.org. To do so, add the following to xorg.conf:

Section "Extensions" Option "Composite" "Enable" EndSection

Why xfwm4 rules:

• Window placement can be configured to be non-annoying.
• Annoying window-snapping can be disabled.
• The compositor provides nice window shadows and transparency on non-focused windows, providing more visual clues about which window is focused. (And it looks nice.)
• Java Swing apps display correctly under xfwm with the compositor enabled. Under compiz, Swing apps don't render correctly; they show up as nothing more than grey rectangles.
• You can close a window by double-clicking its upper-left-corner window-menu icon. Metacity does not support this standard-since-the-1980's behavior.

Downsides to using xfwm4 under GNOME:

• It does not use Metacity themes out of the box. (It has its own themes.) Fortunately, most of the XFWM themes pick up the GTK color scheme.
• Sticky windows are not displayed in all workspaces in the GNOME toolbar pager widget, unlike the XFCE pager widget.
• With the compositor effects enabled, beep-media-player tends to cause X.org to consume all available CPU cycles. Curiously, so far, I've only observed this under XFCE, not under GNOME.
• I had to modify a system file (/usr/bin/gnome-wm) to get xfwm to work properly with GNOME session-management stuff. I prefer not to modify files that are maintained by my distro provider. A more concrete problem is that I won't be able to switch to xfwm4 on systems on which I don't have root access.
• I cannot find a force-quit feature like Metacity has. Rhythmbox locks up every few minutes when I try to listen to Ogg-format internet music streams. With Metacity, I can click the window's Close button; Metacity will detect that there's no response after some timeout; and it will offer to force-quit the app. With xfwm4, I have to find a command-line to do 'killall rhythmbox'. (It's not just Rhythmbox, but that's usually the first and most frequent one.)
• xfwm4's focus-stealing prevention doesn't work, at least not with the versions of things on the Fedora Core 6 box I'm using right now.