SkyratBot b2a352dbf6 [MIRROR] fixes contents not being removed from the spatial grid when deleted during movement between 2 grid cells [MDB IGNORE] (#21524)
* fixes contents not being removed from the spatial grid when deleted during movement between 2 grid cells (#75658)

## About The Pull Request
fixes the flaky test reports for cockroaches being stuck in the spatial
grid (which mothblocks seems to have closed all of)

cockroaches get deleted when they die, so theres a spurious unit test
failure where if a cockroach is on a tile in grid cell A and moves to a
lava tile in grid cell B, they will get killed when lava.Entered() is
called, then deleted, and when /atom/movable/Destroy() is called we try
to take them out of grid cell B (because their loc is the lava tile) but
they were never added to that cell yet because their movement never
finished, so that doesnt do anything. THEN moveToNullspace() is called,
that movement finishes before the first movement, and then in
Moved(old_loc = lava turf) we try to remove it from grid cell B which
again doesnt work, and then the first movements Moved(old_loc = original
turf) is called where we can actually remove them from the correct grid
cell, except we cant because in exit_cell() we subtract
`old_target.important_recursive_contents[channel]` from the cells
content lists, and since the target is deleted by this point it doesnt
have important_recursive_contents. so the fix here is changing this so
it subtracts `old_target.important_recursive_contents?[type] ||
old_target` instead, which works if the target is deleted.

also fixes some Entered() overrides that dont call parent and improves
documentation on spatial grid defines
## Why It's Good For The Game
fixes it without needing the change_loc() setter

* fixes contents not being removed from the spatial grid when deleted during movement between 2 grid cells

---------

Co-authored-by: Kylerace <kylerlumpkin1@gmail.com>
2023-05-31 23:16:41 +12:00

Skyrat 13 (/tg/station Downstream)

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