This patch fixes the escapes handling by avoiding boost built-in
functions that skip whitespaces behind the scenes.

Change-Id: I9607ecd9e2e052aadcba69cf30ec25c981743c49
Reviewed-on: https://gerrit.libreoffice.org/15562Tested-by: Jenkins <ci@libreoffice.org>
Tested-by: David Tardon <dtardon@redhat.com>
Reviewed-by: David Tardon <dtardon@redhat.com>