Closes #4244 by ensuring that the PhotoPage correctly hierarchicalizes tags when adding them.
Closes #4244 by ensuring that the PhotoPage correctly hierarchicalizes tags when adding them.

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