A new browser for exploring the available and supported GEGL operations
for use with the filter API. These include also all operations loaded as
GEGL plug-ins and operations registered from GIMP.
Similarly to the Procedure browser it shows also the details of
individual parameters like the allowed values and default values. In the
case of a type that is not completely supported by the GimpProtocol, the
browser can show useful information about a parameter thanks to a PDB
procedure encoding the information in a placeholder GParamSpec.
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