Distribution/Version: breezy -- the badger of power

if you open an image in eog with the sidebar enabled then I think something like
the following must happen:

1) size of image is determined
2) window size is set accordingly
3) sidebar is added, thus reducing available space for the image
4) image is rescaled to fit into the reduced space

as such, opening images almost never results in them being at 100% zoom level
when they reasonably could be, but rather at 80- or 90-something.

when opening images with the sidebar disabled the problem does not occur.