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QML: The menu icon will does not show up correctly

  • The following standard QML code does not work. Instead of the 3 small bar menu icon (unicode u2630), I get a rectangle with a cross inside: it does not find the character. However it finds the u25C0 left arrow (back triangle button) when required.

    This is only a cosmetic glitch, as it works perfectly.

    Has this anything related to the font, or with a mapping to an icon? How to solve this?

    import QtQuick 2.15
    import QtQuick.Controls 2.15
    ApplicationWindow {
        id: window
        width: 640
        height: 480
        visible: true
        title: qsTr("Stack")
        header: ToolBar {
            contentHeight: toolButton.implicitHeight
            ToolButton {
                id: toolButton
                text: stackView.depth > 1 ? "\u25C0" : "\u2630"
                font.pixelSize: Qt.application.font.pixelSize * 1.6
                onClicked: {
                    if (stackView.depth > 1) {
                    } else {
            Label {
                text: stackView.currentItem.title
                anchors.centerIn: parent

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