Current blueprint isn't "in grey" even if it's been implemented

1. Register a blueprint.
2. Make it dependent on another blueprint.
3. Change the blueprint's status to "Implemented".
4. Observe the dependency tree, with its text "Specifications in grey have been implemented".

What you see: The current blueprint is white with a red border.
What's wrong with this: "Specifications in grey have been implemented" is technically correct, because that all grey blueprints have been implemented does not necessarily mean that all implemented blueprints are grey. However, it is still misleading.
What you should see: Either the current blueprint is "in grey", or the caption is updated.

See also bug 58784.