possibly(?) since...

commit d999b55e
Date:   Sun Dec 10 10:56:38 2017 +0530

    tdf#114200  : added 'Trim space' feature in 'Text Import'

    made a checkbox to Trim extra white spaces from both ends
    while using seperators in 'Text Imort'

Change-Id: I280c5daacdc823ea26d02890ddbc4685a5382e6c
Reviewed-on: https://gerrit.libreoffice.org/65428
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>