deferred-action-function

deferred-action-function is a variable defined in `C source code'.
Its value is

nil

• This variable is obsolete since 24.1;
  use `post-command-hook' instead.
• This variable may be risky if used as a file-local variable.

Documentation:
Function to call to handle deferred actions, after each command.
This function is called with no arguments after each command
whenever `deferred-action-list' is non-nil.