[khelpcenter] [Bug 399275] New: Khelpcenter menu does not work (some parts of TreeView)

[Pavel]

https://bugs.kde.org/show_bug.cgi?id=399275

            Bug ID: 399275
           Summary: Khelpcenter menu does not work (some parts of
                    TreeView)
           Product: khelpcenter
           Version: 5.7.3
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kde-doc-english at kde.org
          Reporter: mars at basealt.ru
  Target Milestone: ---

Created attachment 115343
  --> https://bugs.kde.org/attachment.cgi?id=115343&action=edit
KInfoCenter Modules — Help Center

Summary

Package: kde5-khelpcenter version 5.7.3 
KDE Frameworks Version 5.51.0
Qt Version 5.11.1

KDE Plasma Version 5.13.90
Kernel Version 4.15.0-34-generic
OS Type: 64-bit

NAME="KDE neon"
VERSION="Developer Edition"
ID=neon
ID_LIKE="ubuntu debian"
PRETTY_NAME="KDE neon Developer Edition"
VERSION_ID="18.04"
HOME_URL="http://neon.kde.org/"
SUPPORT_URL="http://neon.kde.org/"
BUG_REPORT_URL="http://bugs.kde.org/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=bionic
UBUNTU_CODENAME=bionic

On 2018.09.26, an upgrade was made by command dist-upgrade. 
Incorrect to works the contents index tree on left half of application window
(TreeWidget) khelpcenter.

STEPS TO REPRODUCE
0. Open «System Settings» (systemsettings5) → Input Devices → Mouse → General →
Choose «Double-click to open files and folders» (!!!)
1. Start khelpcenter (in any way).
2. Choose menu item - "Kinfocenter Modules" -  in the left half of the
application window.
3. Items not expand.

OBSERVED RESULT
1. Pressing the menu items does not result in any result (the corresponding
help information is not displayed in the right half of the application window).
(Open khelpcenter → choose «KinfoCenter Modules» - items not expand )

EXPECTED RESULT
Menu should work correctly:
- all menu items should be displayed,
- subparagraphs should open and disclose subtrees,
- the corresponding help is displayed in the right half of the application
window.

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