#737: Fixes enhancement being run twice when activated while another tool is open.
#737: Fixes enhancement being run twice when activated while another tool is open.


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