Two more tests.

1) I created an /usr/share/xsessions/xterm session that just ran xterm.
At that xterm, I ran metacity. It cleared the wallpaper. I don't think it 
should have cleared it at that point.
I killed metacity and the wallpaper was restored.

2) I created a /usr/local/bin/metacity wrapper, with the following
contents:

#!/bin/sh
exec metacity --no-composite "$@"

With this wrapper the problem was completely solved, i.e. the background
was never cleared during the login process.


So maybe the problem is that metacity by default does compositing, and that it 
initializes its "wallpaper" with a gray color instead of reading the root 
window contents?

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https://bugs.launchpad.net/bugs/1563735

Title:
  Recent gnome-flashback clears the background on login

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