QTextEdit with QGraphicsDropShadowEffect caret overlap issue

[jonathan-f-silva]

I am trying to use a QTextEdit with QGraphicsDropShadowEffect, but the caret is being overlapped by the shadow, maybe am I missing something?

I am using:

• Windows 11 24H2 26100.4349
• Qt Creator 17.0.0
• Qt 6.9.1
• Qt and Qt Creator installed via Qt Online Installer

#include <QApplication>
#include <QWidget>
#include <QTextEdit>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QPalette>
#include <QGraphicsEffect>
#include <QCheckBox>

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

    // ----- Main window ------------------------------------------------------
    QWidget mainWindow;
    mainWindow.setFixedSize(300, 300);
    mainWindow.setWindowTitle("QTextEdit caret bug");

    QPalette pal = mainWindow.palette();
    pal.setColor(QPalette::Window, Qt::white);
    mainWindow.setAutoFillBackground(true);
    mainWindow.setPalette(pal);

    // ----- QTextEdit --------------------------------------------------------
    QTextEdit *textEdit = new QTextEdit;
    textEdit->setFixedSize(200, 200);
    textEdit->setText("Dark‑yellow bold 20 px text on transparent background");
    textEdit->setFrameStyle(QFrame::NoFrame);

    textEdit->setStyleSheet(
        "QTextEdit {"
        "background: transparent;"
        "color: #B8860B;"
        "font-weight: bold;"
        "font-size: 20px;"
        "}"
        );

    // ----- Drop shadow effect -----------------------------------------------
    auto *shadowEffect = new QGraphicsDropShadowEffect(&mainWindow);
    shadowEffect->setBlurRadius(10.0);
    shadowEffect->setOffset(3, 3);
    shadowEffect->setColor(QColor(0, 0, 0, 128));
    textEdit->setGraphicsEffect(shadowEffect);

    // ----- Checkbox to toggle shadow ----------------------------------------
    auto *shadowCheckBox = new QCheckBox("Enable drop shadow");
    shadowCheckBox->setStyleSheet("QCheckBox { color: black; }");
    shadowCheckBox->setChecked(true);
    QObject::connect(shadowCheckBox, &QCheckBox::toggled,
                     shadowEffect,      &QGraphicsEffect::setEnabled);

    // ----- Layout -----------------------------------------------------------
    auto *vLayout = new QVBoxLayout(&mainWindow);
    vLayout->addStretch();

    auto *hText = new QHBoxLayout;
    hText->addStretch();
    hText->addWidget(textEdit);
    hText->addStretch();
    vLayout->addLayout(hText);

    auto *hCheck = new QHBoxLayout;
    hCheck->addStretch();
    hCheck->addWidget(shadowCheckBox);
    hCheck->addStretch();
    vLayout->addLayout(hCheck);

    vLayout->addStretch();

    mainWindow.show();
    return app.exec();
}