Add MapCache::propagateVerticalFlags - #5970
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Propagate light, outside, and subterranean flags to tiles below a tile that changed between an open and a solid shape, matching how the game maintains sky exposure. Handles both directions: exposing tiles copies the changed tile's flags downward, while covering tiles clears the light/outside flags of the column below.
This was referenced Sep 22, 2026
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Propagate light, outside, and subterranean flags to tiles below a tile that changed between an open and a solid shape, matching how the game maintains sky exposure. Handles both directions: exposing tiles copies the changed tile's flags downward, while covering tiles clears the light/outside flags of the column below.
this is a generalization of code in
dig-nowthat has use elsewhere - a subsequent PR will pull the use indig-nowout