GDM incorrectly runs xsetroot, should keep background image (trivial fix)

[Kristoffer Grönlund]

Binary package hint: gdm

Getting GDM to keep the background image from the login theme is a trivial fix.

1. In the GDM package, change config/PreSession.in to not run xsetroot at all. Just remove everything related to #Set background color.
This change is already made upstream.

2. In the theme, add the attribute background="true" to the item tag that defines the background image. For example, in the default Human theme, this would mean putting this in the Human.xml file:

  <!-- background -->
  <item type="pixmap" background="true">
    <normal file="background.png"/>
    <pos y="0" x="0" width="100%" height="100%"/>
  </item>

3. Profit. Now instead of getting a plain colored background while waiting for the session to be logged in, the background image set in GDM is kept all the way until nautilus sets its background.

[Sebastien Bacher (seb128)]

The issue is fixed in the karmic version