[2.1.17] Hidden Technology becomes visible once it is triggered

[hgschmie]

Consider this technology prototype:

Code: Select all

{
  type = "technology",
  name = "secret-gate",
  hidden = true,
  research_trigger = {
    type = "build-entity",
    entity = "roboport"
  }
}

This works fine and the technology is not visible in the tech tree (so I can have other technology depend on it which in turn becomes researchable when this gets unlocked).

However, if I place a roboport, I get a "secret-gate researched" alert on the screen and afterwards it is visible in the tech tree.

I would have expected that "hidden" means hidden (i.e. does not fire alerts and does not become visible in the tech tree).