Please describe the problem:
When Nautilus create the thumbnails for images, some of the images show the
frame around the content and other don't. This bug occurs indifferently with
png, gif and jpeg. See this screenshot for an example:
http://img460.imageshack.us/img460/4822/nautilus2ii.png

Those images were generated in different days with gimp, imagemagick and the PNG
exporter of Matlab. The problem is generally reproducible, but after I've
upgraded nautilus 2.12.x to nautilus 2.14.x some images that were displayed with
the frame suffer from this problem.

At first I thought that the bug could be related to the presence of an embedded
thumbnail, but I think that for consistency sake the frame should be always added.

Steps to reproduce:


Actual results:


Expected results:


Does this happen every time?


Other information: