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  1. Qt
  2. QTBUG-80634

When a base class and sub class both declare attached QML properties, only the base class is used in QML

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      1. Cherry-pick https://codereview.qt-project.org/c/qt/qtdeclarative/+/284119
      2. Build qtdeclarative
      3. Run tests/auto/quick/qquicklayouts/tst_qquicklayouts -input /path/to/qt5/sources/qtdeclarative/tests/auto/quick/qquicklayouts/data/tst_stacklayout.qml

      You will get output like this:

      ********* Start testing of qquicklayouts *********
Config: Using QtTest library 6.0.0, Qt 6.0.0 (x86_64-little_endian-lp64 shared (dynamic) debug build; by GCC 7.4.0)
PASS   : qquicklayouts::Tests_StackLayout::initTestCase()
FAIL!  : qquicklayouts::Tests_StackLayout::test_attachedIndex() Compared values are not the same
   Actual   (): undefined
   Expected (): 0
   Loc: [/home/mitch/dev/qt5.15/qtdeclarative/tests/auto/quick/qquicklayouts/data/tst_stacklayout.qml(131)]
PASS   : qquicklayouts::Tests_StackLayout::test_rearrange()
PASS   : qquicklayouts::Tests_StackLayout::cleanupTestCase()
Totals: 3 passed, 1 failed, 0 skipped, 0 blacklisted, 26ms
********* Finished testing of qquicklayouts *********

      If you then add a print(item1.StackLayout) before that failure, you'll see this:

      qml: QQuickLayoutAttached(0x60d00003aec0)

      It should print QQuickStackLayoutAttached.

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            qt.team.quick.subscriptions Qt Quick and Widgets Team
            mitch_curtis Mitch Curtis
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              Resolved:

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