Once-links aren't disabled when loading a game

[juhana]

Steps to reproduce:

• Click on a once-link that leads to an action. The link will be disabled.
• Save the game.
• Load the game. The once-link stays active.

Seems like there isn't an easy fix because the saving mechanism doesn't save information about what kind of link was clicked.

[idmillington]

Right. Hmm, this is tricky. Not sure how to do this. I'll leave the issue as a 'I'm stuck' one ;)