[gimp] (18 commits) Non-fast-forward update to branch wip/Jehan/CI-Windows

[Jehan <jehanp src gnome org>]

The branch 'wip/Jehan/CI-Windows' 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:

  a6ffaea... Temporarily get rid of all other stages.
  451609a... build, gitlab-ci: add a script to cross-build GIMP with Git
  e95b20e... gitlab-ci: move to debian testing image as base.
  50d0a60... Move to Debian testing (TODO: will be rebased).
  33329f5... Test with Fedora image instead.

Commits added to the branch:

  9593121... app, libgimpwidgets: return visible widgets from all gimp_p (*)
  cb40cfd... Issue #3983 - gimp_get_images returns NULL pointer whilst n (*)
  505473a... plug-ins: gih_save(): file-gih-save-internal takes a GFile  (*)
  e8ed263... plug-ins: port file-sunras to GimpProcedureConfig (*)
  1f7c823... libgimpwidgets: remove the gimp_radio_group_*() functions (*)
  9cb62f5... libgimp: move "image" and "run_mode" from gimp_procedure_co (*)
  e4acb96... plug-ins: port file-xpm to GimpProcedureConfig (*)
  45e96a0... libgimp: improve handling of procedure default values a lot (*)
  2ea77e8... Updated Slovenian translation (*)
  44ad1a6... Updated Slovenian translation (*)
  8829a72... Updated Slovenian translation (*)
  5c96634... Updated Slovenian translation (*)
  eb07034... Updated Slovenian translation (*)
  ab16f00... Update Catalan translation (*)
  80e2e0a... Issue #3990: make the status of the XCF docs a bit clearer  (*)
  9f65b74... build, gitlab-ci: add a script to cross-build GIMP with Git
  695126c... libgimp: fix meson build.
  7c7b24b... gitlab-ci: run gdk-pixbuf-query-loaders.

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