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Ell authored
Add a framework for saving and restoring internal data objects, in gimp-internal-data.c. Internal data objects are saved in separate files under a new "internal-data" subdirectory of the user's gimp directory. The internal data is saved, restored, and cleared together with the tool options. Use this to save and restore the custom gradient. In the future, we might add similar writable internal data objects that we'd want to save.
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