No way to set the "fade length" in scripts

Submitted by Ofnuts (@Ofnuts)

Link to original bug (#795667)

Description

Using the PDB browser (Python or Script-fu) I cannot find a way to set the "fade length" that can be set in the GUI paint tool options. Looked for anything with "context", "fade" or "length" in the name.

Oversight?

Version: 2.10.0