Bug 177176

Description of problem:

With the growing number of wide-aspect screens on the market, desktop
backgrounds (especially the default one) need to take into account these screen
dimensions.

While using the 'fill-screen' option works to some degree, it leaves artwork
(especially text and logos - often present on the default background) mis-shaped.

What is needed is a two fold approach.

Firstly, background artwork needs to be supplied in a wide aspect format.  For
example, 1920 x 1200, instead of 1600 x 1200.  This would fill all but the
largests screen (and maybe it needs to be bigger again).

In conjunction with this, the background dialog needs an option to 'scale, but
fill screen'.  The current scale option sees the image scaled, but only to the
narrower of the two sizes, so for example a 1600x1200 images on a 1920x1200
screen would have space on either side, but a 1920x1200 image on a 1600x1200
screen would see the background with space above and below.  This new option
would see a 1920x1200 image on a 1600x1200 screen scaled, but with the sides
chopped off.  By doing this, you could extend current artwork to fit wide-aspect
screens, but so that they also work on standard 4x3 format screens too.
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