On remember.el, when option 'remember-handler-functions' contains
handler 'remember-diary-extract-entries', entries will be appended to
Diary file. However, the Diary file will not be saved automatically. I
could not find any documentation describing if this behavior is
expected, and the docstring for 'remember-save-after-remembering' does
not mention how the Diary file should be handled in this case. Given
that, there is a patch attached to automatically save the Diary file
when option 'remember-save-after-remembering' is 't'. If this is the
wrong behavior, we could improve the improve the docstring or show the
Diary buffer to user after data is appended.