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Type: Bug
Resolution: Fixed
Priority: P2: Important
Fix Version/s: 6.5.5-1, 6.6.3, 6.8.0 FF
Affects Version/s: 6.3.2, 6.4.0, 6.5.2, 6.6.2
Component/s: Widgets: Itemviews
Labels:
None
Environment:
Windows10 + Qt

Platform/s:

Windows
Commits:
1ac58f4ba (dev), da59bc343 (6.7), 347b35a44 (6.6), 3bc823495 (tqtc/lts-6.5)

Hello!
When I create a view/model and display the view's CheckBox, I only need to set the Qss about QAbstractItemView::indicator, such as QAbstractItemView::indicator { width: 6px; height: 6px; border: 1px solid black;}
Then the display of the View is messed up at this time, and it looks like the original CheckBox and Styled CheckBox are drawn together.
But this demo runs normally on Qt5.15.2. You can use the following simple Demo to reproduce:

#include <QtWidgets>

class TestModel : public QAbstractListModel
{
    Q_OBJECT
public:
    explicit TestModel(const QList<QString>& vals, QObject *parent = nullptr) : QAbstractListModel(parent), vals_{vals}{}

    int rowCount(const QModelIndex &parent = QModelIndex()) const {
        Q_UNUSED(parent)
        return vals_.size();
    }
    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const {
        if (!index.isValid())
            return QVariant();

        switch(role) {
        case Qt::DisplayRole:
            return vals_.at(index.row());
        case Qt::CheckStateRole:
            return Qt::Unchecked;
        default:
            break;
        }
        return QVariant();
    }

private:
    QList<QString> vals_;
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QListView view;
    view.setWindowTitle(qVersion());
    view.setModel(new TestModel(QList<QString>{QStringLiteral("11111"), QStringLiteral("22222"), QStringLiteral("33333")}, &view));
    view.setStyleSheet(QStringLiteral("QAbstractItemView::indicator { width: 6px; height: 6px; border: 1px solid black;}"));
    view.show();

    return a.exec();
}

#include "main.moc"