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Implement propagate vertical flags in dig-now - #5971

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ab9rf wants to merge 2 commits into
DFHack:developfrom
ab9rf:implement-propagate-vertical-flags
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ab9rf wants to merge 2 commits into
DFHack:developfrom
ab9rf:implement-propagate-vertical-flags

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@ab9rf

@ab9rf ab9rf commented Sep 22, 2026

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Depends on/incorporates #5970

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.
Switch to MapCache helper instead of the plugin-local
propagate_vertical_flags.
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