#36 Webkit Full Page Background Colors/Pictures

[Nick Peshek]

I changed the way that background images were handled so that
they would always take up all the space behind the message view,
no matter what size the image is. Seems to work fine with all the
message styles I tested it with and all combinations of background
colors/images.

[Nick Peshek]

The patch in .patch format

[Nick Peshek]

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I updated this patch to add a preference to select between several
background layout types (Fill, Tile, Do Not Stretch, and Center). Includes
an updated nib and a reworked patch.

[Nick Peshek]

Updated Background Image Patch (.zip format)

[Evan Schoenberg]

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Looking good. :)

One change before I commit it: Could you have it use a typedef enum for
the 4 different background layout types instead of the numbers 0 through
4, for improved readability? Thanks.