bee fields can't merge.

[kevingranade]

i added bee fields as a source of danger for the granade item to balance the unintended stat-roulette effect it had, but I don't want to include them anywhere 'serious' in the game because there was a technical issue I couldn't solve.
I couldn't figure out how to get bee fields to merge without having them move at different speeds based on which direction they were moving.
specifically, if a field merges with a field south and or east of it, the field it merges into will be processed again, and move in the same direction, but if the field moves north or west this doesn't happen.

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[kevingranade]

Looks like this needs to be a two-pass algorithm, first build a list of moving bee fields as we iterate over the map recording each source, destination and density, then iterate over each of those at the end when we can track "how many bees" we expected to move from point A to point B(ee).
for example, say there are two fields of density 1 at 1,1 and 1,2, and the player is at 1,4. The bees head toward the player, so we record:
{{1,1}, {1,2}, 1}, {{1,2},{1,3}, 1}
after processing the first, we end up with a density 2 field at 1,2, but when we process the second entry, we note only one density of field was supposed to merge, so we split it back into a str 1 field at 1,2 and a str 1 field at 1,3.

[Leland]

@kevingranade this is one of the oldest issues on the repo - you want to keep it open?

[kevingranade]

Considering it's a still-present bug (about bugs), yes.

[kevingranade]

Removing in #64679