Cleaned up Thumbnail's implementation to take advantage of MediaSource's genericities.
Cleaned up Thumbnail's implementation to take advantage of MediaSource's genericities.


abrauchli/shotwell,polymeris/shotwell,damianmoore/shotwell,Sanva/shotwell-gsoc,damianmoore/shotwell,jimbonator/shotwell,ritchiewilson/shotwell,jof/shotwell,abrauchli/shotwell,h4ck3rm1k3/shotwell,polymeris/shotwell,Sanva/shotwell-gsoc,ritchiewilson/shotwell,jof/shotwell,h4ck3rm1k3/shotwell,h4ck3rm1k3/shotwell,ritchiewilson/shotwell,abrauchli/shotwell,polymeris/shotwell,jimbonator/shotwell,Sanva/shotwell-gsoc,jof/shotwell,damianmoore/shotwell,jimbonator/shotwell