gnus-subthread-sort-functions

gnus-subthread-sort-functions is a variable defined in `gnus-sum.el'.
Its value is

gnus-thread-sort-functions

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

Documentation:
*List of functions used for sorting subthreads in the summary buffer.
By default, subthreads are sorted the same as threads, i.e.,
according to the value of `gnus-thread-sort-functions'.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.4 of Emacs.