fix min/max entries with dpointer

Summary:
D27497 was causing cases with dpointer + min/max to fail
Specifically, this okular build: https://build.kde.org/job/Applications/job/okular/job/kf5-qt5 SUSEQt5.12/175/console

Test Plan: Added min/max to dpointer autotest

Reviewers: meven, ervin

Subscribers: kde-frameworks-devel, aacid

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D27717