[QTBUG-102825] Popping QML StackView Item makes a11y unusable - Qt Bug Tracker

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Details

Type: Bug
Status: Closed
Priority: P1: Critical
Resolution: Done
Affects Version/s: 6.3.0
Fix Version/s: 5.15.11, 6.2.6, 6.4.0 RC1, 6.5.0 Beta1
Component/s: GUI: Accessibility (a11y)
Labels:
Environment:
Samsung Galaxy S21, Android 11
Samsung Galaxy S21, Android 12

Platform/s:

Android
Commits:
d48ebb02fb (qt/qtbase/dev) d48ebb02fb (qt/tqtc-qtbase/dev) ce89c4a3d5 (qt/qtbase/6.3) ce89c4a3d5 (qt/tqtc-qtbase/6.3) 68158a8ae9 (qt/qtbase/6.4) 68158a8ae9 (qt/tqtc-qtbase/6.4) 680a33e241 (qt/tqtc-qtbase/6.2) 37d593b935 (qt/tqtc-qtbase/5.15)
Sprint:
2022wk26FOQtforAndroid

Description

Popping even a relatively simple Item from a StackView on Android messes up the a11y hierarchy, making the app basically unusable in the process.

After pushing and popping an Item in the example below, the "Push"-Button stops appearing in the hierarchy and while sometimes filling the whole screen. Additionally the log is filled with the warning "W Qt A11Y : Accessibility: populateNode for Invalid ID".

The problem gets worse, the more complex the Views are, even freezing TalkBack for the whole device, so the user can't interact with the SystemUi itself. So it might be related to QTBUG-102594

ApplicationWindow {
    title: qsTr("Hello World")
    width: 640
    height: 480
    visible: true

    StackView {
        id: stack
        initialItem: mainView
        anchors.fill: parent
    }

    Component {
        id: mainView

        Row {
            spacing: 10

            Button {
                text: "Push"
                onClicked: stack.push(mainView)
                Accessible.onPressAction: clicked()
                Accessible.description: "Push an Item"
            }
            Button {
                text: "Pop"
                enabled: stack.depth > 1
                onClicked: stack.pop()
                Accessible.onPressAction: clicked()
                Accessible.description: "Pop an Item"
            }
            Button {
                text: "Dummy"
                Accessible.description: "Dummy"
            }
            Text {
                text: stack.depth
            }
        }
    }
}