Ray Strode b1a6940188 background: add slide show support
gnome-desktop's background drawing code supports an
XML format for presenting backgrounds based on time of day,
monitor geometry, etc. Now that we don't use gnome-desktop for drawing the
background, we need to implement that support ourselves to maintain
feature parity.

This commit implements that.

https://bugzilla.gnome.org/show_bug.cgi?id=682429
2013-02-19 18:39:54 -05:00
..
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