[gimp] (5 commits) Non-fast-forward update to branch nielsdg/plug-ins-migrate-gtkaction

[Jehan <jehanp src gnome org>]

The branch 'nielsdg/plug-ins-migrate-gtkaction' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  d67476f... plug-ins: Remove GtkAction from unit editor
  02bab20... libgimpwidgets: use "system-help" for GIMP_ICON_HELP.
  e7c11df... plug-ins: fix the new unit editor (!655).

Commits added to the branch:

  5df4875... app: do not depend on returned image for successful file_op (*)
  c928fda... app: fix GEX installation with warning while decompressing. (*)
  567d7be... plug-ins: Remove GtkAction from unit editor
  dc8298c... libgimpwidgets: use "system-help" for GIMP_ICON_HELP.
  e4e87d6... plug-ins: fix the new unit editor (!655).

(*) This commit already existed in another branch; no separate mail sent