The core distance algorithm rewrite took more effort than I expected. Nevertheless I finally managed to get it to work. The biggest problem I encountered was that the code would frequently enter into infinite cycles when recalculating core distances. I think I managed to handle all circumstances that would trigger this issue though.

With that out of the way, I spent the rest of the weekend creating an experimental version of the new action toolbar, here's a screenshot of the mockup:

This toolbar shows a set of action categories that the player can take when controlling a faction. The first, from top to bottom, is the "territory" category. Here's where I'm going to add the action to promote tribal migration into neighboring regions. The second category is "politics and diplomacy", which is going to remain empty for now. Though later I'm going to move convert some of the existing decisions into actions that would fit into this category. Finally, the red button at the bottom will close the toolbar and relinquish control of the faction back to the AI. This toolbar will behave in a very similar fashion to the map editor toolbar, so it will be possible to drag it around the screen if needed and will disappear when not used. Buttons will also only show up when there are actions available to be performed. The design and art is not final. I might eventually replace it with a better design. Still, I think it will work fine for the next release.

Next weekend I will continue working on the toolbar to make it functional in-game, then I'll start working on the tribal migration action that will be accessed by players through the toolbar.