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  1. Qt
  2. QTBUG-135448

[REG: 6.8.2 → 6.8.3] Behavior or QQmlEngine::clearComponentCache changed in Qt 6.8.3

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      Behavior of QQmlEngine::clearComponentCache has changed in 6.8.3 in comparison to 6.8.2 and earlier versions, affecting users functionalities relying on that method and it's behavior.

       

      The following code:

      import QtQuick
import QtQuick.Controls
import Test

Window {
    id: root

    visible: true

    function load() {
        const component = Qt.createComponent(`MyItem.qml`)
        return component.createObject(root)
    }

    Component.onCompleted: {
        let instance = load()
        console.log(instance)
        instance.destroy()

        CacheCleaner.clearComponentCache()
        instance = load()
        console.log(instance)
    }
}

      On Qt 6.8.2 prints:

      qml: MyItem_QMLTYPE_2(0x7ee6a4002df0)
qml: MyItem_QMLTYPE_3(0x5706d0db0dd0)

      The component has been removed from the cache resulting with other type name for the second instance.

      On Qt 6.8.3:

      qml: MyItem_QMLTYPE_2(0x71a958002df0)
qml: MyItem_QMLTYPE_2(0x5cc39bb09c00)

      The type remains the same.

      To achieve similar behavior (but not exactly the same) it can be modified to e.g.:

       

      import QtQuick
import QtQuick.Controls
import Test

Window {
    id: root

    visible: true

    function load() {
        const component = Qt.createComponent(`MyItem.qml`)
        return component.createObject(root)
    }

    Component.onCompleted: {
        const instance = load()
        console.log(instance)
        instance.destroy()

        CacheCleaner.clearComponentCache()

        Qt.callLater(() => {
            CacheCleaner.clearComponentCache()
            const instance = load()
            console.log(instance)
        })
    }
}

      However it's also not clear why two separate calls to QQmlEngine::clearComponentCache are needed to achieve desired effect of cache clearing.

       

        1. qt6_test_project.zip
          3 kB
          Michał Cieślak
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            ulherman Ulf Hermann
            michalc Michał Cieślak
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              Created:
              Updated:
              Resolved:

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