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ba3da3d338
This abstract spec type is basically a GParamSpecObject with a default value. It will be used by various object spec with default values, such as GimpParamSpecColor, GimpParamSpecUnit and all GimpParamSpecResource subtypes. Also it has a duplicate() class method so that every spec type can implement the proper way to duplicate itself. This fixes the fact that in gimp_config_param_spec_duplicate(), all unknown object spec types (because they are implemented in libgimp, which is invisible to libgimpconfig) are just copied as GParamSpecObject, hence losing default values and other parameters. As a second enhancement, it also makes it easier to detect the object spec types for which we have default value support in gimp_config_reset_properties(). As a side fix, gimp_param_spec_color() now just always duplicates the passed default color, making it hence much easier to avoid bugs when reusing a GeglColor.