Comment 3 for bug 777760

I'm aware that the extension doesn't include automatic updating since it is a static effect.

Related feature requests:
Bug #691839 “Fine tune Pen as a measure tool with Edit Paths tool”
Bug #171494 “Measurement tools”

Related blueprint:
Geometric & Tech Drawing
<https://blueprints.launchpad.net/inkscape/+spec/tech-drawing>

The current implementation of the tech-drawing tools (part of the experimental LPEs, needs to be enabled at compile time) already do include a path effect to display the path length dynamically.