D17720: Allow direct link to the help page when the "Help" button is pressed in the settings window

[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
  Since KF 5.52 it is possible (again) to open a particular page in KHelpCenter.
  
  However, setHelp() is protected. Thanks to the hint by a reviewer of D17620 <https://phabricator.kde.org/D17620>, it is possible to call the method needed.

TEST PLAN
  Compiles and can be run. The link in the "Configure" window ("Help" button) works as expected.

REPOSITORY
  R327 Kanagram

REVISION DETAIL
  https://phabricator.kde.org/D17720

AFFECTED FILES
  src/mainwindow.cpp

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