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Ell authored
... leading to a crash Add gimp_data_is_copyable() and gimp_data_is_dulicatable(). Use gimp_data_is_duplicatable() when setting the sensitivity of the various "foo-duplicate" actions, instead of inspecting the object's GimpDataClass::duplicate pointer directly, since this is no longer an indication of whether a GimpData object is duplicatable or not (since commit 33de4d55).
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