QTreeWidget item border style breaks selection style

Nikita Kobzev

Hi there. I'm trying to customize a QTreeWidget::item (QT v.6.0.0 msvc2019_64) and set a look for a border.

Here is the unstyled component without/with selected items. It looks good:

But once I put the style to the widget:

QTreeWidget::item {
	border-bottom: 1px dotted grey;
}

Something strange happens. The unselected view of the widget looks as expected, but when I select items, the view gets broken.

What exactly goes wrong is:

Outline color changes to Red.
Background of items loses its default Blue highlight.

Can anyone point me out, cow could a border style cause that? Did I do something wrong, or that is a QT bug?

VRonin

Bug confirmed (On windows) for Qt 6.0.
Please try installing Qt 6.1.1 and see if it's already fixed.
If it's not, open a bug report, you can attach the below as a minimal example:

#include <QApplication>
#include <QTreeWidget>
#include <QDialog>
#include <QDialogButtonBox>
#include <QVBoxLayout>

int main(int argc, char *argv[])
{
    QApplication app(argc,argv);
    QDialog dial;
    dial.setWindowTitle(QStringLiteral("Edit Headers"));
    QDialogButtonBox *dialButtons = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel, &dial);
    QObject::connect(dialButtons, &QDialogButtonBox::accepted, &dial, &QDialog::accept);
    QObject::connect(dialButtons, &QDialogButtonBox::rejected, &dial, &QDialog::reject);
    QTreeWidget* treeWidget = new QTreeWidget(&dial);
    treeWidget->setColumnCount(2);
    treeWidget->model()->insertRows(0,2);
    treeWidget->model()->setHeaderData(0,Qt::Horizontal,QStringLiteral("Name"));
    treeWidget->model()->setHeaderData(1,Qt::Horizontal,QStringLiteral("Value"));
    treeWidget->model()->setData(treeWidget->model()->index(0,0),QStringLiteral("h1"));
    treeWidget->model()->setData(treeWidget->model()->index(0,1),QStringLiteral("v1"));
    treeWidget->model()->setData(treeWidget->model()->index(1,0),QStringLiteral("h2"));
    treeWidget->model()->setData(treeWidget->model()->index(1,1),QStringLiteral("v2"));
    QVBoxLayout* dialLay = new QVBoxLayout(&dial);
    dialLay->addWidget(treeWidget);
    dialLay->addWidget(dialButtons);
    dial.setStyleSheet(QStringLiteral("QTreeWidget::item { border-bottom: 1px dotted grey; }"));
    dial.show();
    return app.exec();
}