org-blocker-hook

org-blocker-hook is a variable defined in `org.el'.
Its value is

nil

• This variable may be risky if used as a file-local variable.

Documentation:
Hook for functions that are allowed to block a state change.

Functions in this hook should not modify the buffer.
Each function gets as its single argument a property list,
see `org-trigger-hook' for more information about this list.

If any of the functions in this hook returns nil, the state change
is blocked.