This extension covers 1000+ Functions available in GIMP's Python plugin API. All these functions are now just a few keys away. Simply type some letters of a function name and press Tab/Enter. The full function signature together with arguments (if any) shall appear at cursor location. Imagine how much typing that would save you.
You don't need to type pdb or any of the prefixes, like gimp, python_fu, script_fu, etc. Just type a few letters from the "true name" of a function. Observe the patterns used in examples.
You could use Tab and Shift+Tab to cycle forward and backward through arguments.
If you accidentally invoke an undesirable completion, performing a simple Undo ctrl + z might be a better fix, rather than manually deleting the unwanted bits.
Notes
The data is based upon GIMP 2.10.20 r1.
All deprecated functions have been filtered out.
This plugin is released under ... GNU General Public License (v3).