filesets-menu-cache-contents

filesets-menu-cache-contents is a variable defined in `filesets.el'.
Its value is

(filesets-be-docile-flag filesets-submenus filesets-menu-cache filesets-ingroup-cache)

Documentation:
Stuff we want to save in `filesets-menu-cache-file'.

Possible uses: don't save configuration data in the main startup files
but in filesets's own cache. In this case add `filesets-data' to this
list.

There is a second reason for putting `filesets-data' on this list. If
you frequently add and remove buffers on the fly to :files filesets, you
don't need to save your customizations if `filesets-data' is being
mirrored in the cache file. In this case the version in the cache file
is the current one, and the version in your startup file will be
silently updated later on.

If you want caching to work properly, at least `filesets-submenus',
`filesets-menu-cache', and `filesets-ingroup-cache' should be in this
list.

Don't forget to check out `filesets-menu-ensure-use-cached'.

You can customize this variable.