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List:       kde-bugs-dist
Subject:    [kirigami] [Bug 377037] New: PageRow sliding & clicking page produces TypeError (Cannot read propert
From:       <bugzilla_noreply () kde ! org>
Date:       2017-02-28 22:19:02
Message-ID: bug-377037-17878 () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=377037

            Bug ID: 377037
           Summary: PageRow sliding & clicking page produces TypeError
                    (Cannot read property 'anchors' of nul).
           Product: kirigami
           Version: Master
          Platform: Debian unstable
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: notmart@gmail.com
          Reporter: jm.ouwerkerk@gmail.com
  Target Milestone: Not decided

Created attachment 104279
  --> https://bugs.kde.org/attachment.cgi?id=104279&action=edit
QML example demonstrating the issue

It is possible to provoke the Kirigami PageRow component into attempting to
deref a null value by pushing a new page to the pageStack.

Steps to Reproduce:

 1. Load the attached QML file with qmlscene
 2. Click the "Demonstrate the bug" button 3 times or more (it doesn't need
'rapid' clicks, just repeated clicks to trigger the bug).
 3. Observe the console output of qmlscene: on or more TypeErrors should be
reported, the first of which references line 436 of the PageRow source.

Burried inside the PageRow component, at lines 436 the following is attempted:

```
    // at line 435:
    onPageChanged: {
        page.parent = container;
        page.anchors.fill = container;
    }
```

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