code/__DEFINES/overlays.dm 
VALIDATE_OVERLAY_LIMIT | Checks if an atom has reached the overlay limit, and make a loud error if it does. |
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POST_OVERLAY_CHANGE | Performs any operations that ought to run after an appearance change |
Define Details
POST_OVERLAY_CHANGE 
Performs any operations that ought to run after an appearance change
VALIDATE_OVERLAY_LIMIT 
Checks if an atom has reached the overlay limit, and make a loud error if it does.