quality.
* app/display/gimpdisplayshell-render.c:
(compute_sample): reshuffle a bit of the fixed point induced
shifting to allow higher precision.
(render_image_tile_fault): remove need to disable box-filter
for some non square zoom ratios that was needed before
compute_sample cleanup.
, (render_image_tile_fault_one_row): fetch source sample #1
from the correct tile.

svn path=/trunk/; revision=23360