D17585: Fix print preview in Kig

[Yuri Chornoivan]

yurchor created this revision.
yurchor added a reviewer: KDE Edu.
Herald added a project: KDE Edu.
Herald added a subscriber: kde-edu.
yurchor requested review of this revision.

REVISION SUMMARY
  Currently, print preview shows nothing due to the lack of connection.
  
  This patch tries to fix this.

TEST PLAN
  1. Open an example plot.
  2. Select "File -> Print preview". The print preview should be shown.
  
  F6476956: kig.png <https://phabricator.kde.org/F6476956>

REPOSITORY
  R331 Kig

REVISION DETAIL
  https://phabricator.kde.org/D17585

AFFECTED FILES
  kig/kig_part.cpp

To: yurchor, #kde_edu
Cc: kde-edu, narvaez, apol
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