QTreeView on QMainWindow Impossible to Select Row

[Polla]

Please help, this issue is so frustrating, not sure what I am doing wrong.
On Windows, the two examples described below works correctly, but not Example #2 on Android.

(I am testing on a Samsung Galaxy S22 Ultra, OS Version: Android 14.0, SDK 34)

Example #1
When showing a QTreeView on Windows and Android, row selection works normal.

Example #2
But when the QTreeView is on a QMainWindow, selecting rows on Windows work as expected, but on Android are basically impossible. It seems like the click coordinates are wrongly translated or something. If I click to the top-left of where the QTreeView is, I am almost able to click something, but the behavior is clearly wrong.

Please see my code below - comment on the TOGGLE define to switch between Examples #1 and #2 when compiling.
Also attached are screen captures taken on Android to show the issue.

#include <QApplication>
#include <QMainWindow>
#include <QToolBar>
#include <QTreeView>
#include <QStandardItemModel>

// comment or uncomment to toggle between examples
#define TOGGLE

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

    QStandardItemModel model;
    model.setHorizontalHeaderLabels({ "Fruit" });
    model.setItem(0, new QStandardItem("Apples"));
    model.setItem(1, new QStandardItem("Grapes"));
    model.setItem(2, new QStandardItem("Pears"));
    model.setItem(3, new QStandardItem("Watermelons"));

#ifdef TOGGLE
    // EXAMPLE #1 - row clicks work correctly on Android
    QTreeView tree;
    tree.setSelectionBehavior(QAbstractItemView::SelectionBehavior::SelectRows);
    tree.setSelectionMode(QAbstractItemView::SelectionMode::SingleSelection);
    tree.setModel(&model);
    tree.showMaximized();
#else
    // EXAMPLE #2 - row clicks do not work correctly on Android
    QTreeView *tree = new QTreeView();
    tree->setSelectionBehavior(QAbstractItemView::SelectionBehavior::SelectRows);
    tree->setSelectionMode(QAbstractItemView::SelectionMode::SingleSelection);
    tree->setModel(&model);

    QToolBar *toolbar = new QToolBar();
    toolbar->addAction("File");
    toolbar->addAction("Edit");
    toolbar->addAction("View");
    toolbar->addAction("Window");

    QMainWindow window;
    window.addToolBar(toolbar);
    window.setCentralWidget(tree);
    window.showMaximized();
#endif

    return app.exec();
}

Screenshot of Example #1 (correct behavior)

Screenshot of Example #2 (incorrect behavior, impossible to correctly select a row)

[Axel Spoerl]

That’s a bug in Qt.
The reproducer is wonderful, thanks! Please file a bug report with that reproducer at https://bugreports.qt.io.

[Polla]

Thank you, bug logged QTBUG-129191

[MartinGU]

I installed Qt 6.6.3 and and tried my C++ widget application (QList and QLineEdit).
The bugs in 6.7.2 was NOT there. So instead of rewriting in QML I continue with 6.6.3 for Android projects.

[MartinGU]

Not solved in 6.8 :(