Issue #12289: Replace GimpContext with GeglColor in gimp:offset
This patch attempts to resolve issue #12289 (closed).
The gimp:offset filter has a GimpContext property. Currently it is serialized and saved as a GimpConfig. On load however, it tries to call a now non-existent Gimp object from the context, which crashes.
EDIT: This patch replaces the parameter with GeglColor instead, and updates related functions to account for this.
Edited by Alx Sa