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Details

Type: Bug
Resolution: Fixed
Priority: P3: Somewhat important
Fix Version/s: 6.5.0, 6.6.0
Affects Version/s: 5.12.1, 5.12.4, 5.13.0, 6.4.1
Component/s: Widgets: Main Window
Labels:
- Reported_by_support_2H22
- reported_by_support_standard

Platform/s:

Windows
Commits:
5edb71c6d (dev), fe4955c2f (6.5)

Description

We followed the documented method to restore the application state:

https://doc.qt.io/qt-5/restoring-geometry.html

and it is not working as documented.

https://doc.qt.io/qt-5/qwidget.html#restoreGeometry

"If the restored geometry is off-screen, it will be modified to be inside the available screen geometry."

Using Windows 10, if you have a second monitor to the right of your main monitor and place the application on it (it was not in the maximized state (haven't tested in the maximized state)), close the application so the state is saved on the second monitor, undock your laptop so only the main monitor is available, then re-open the application, it opens off-screen.

Note: this was not the case when the second monitor was above the main monitor.

Simplified Sample Code:

class MyTest : public QMainWindow
{
  public:
    MyTest() : QMainWindow()
    {
      QSettings settings(QStringLiteral("org"), QStringLiteral("test"));
      settings.beginGroup(QStringLiteral("GROUP"));
      restoreGeometry(settings.value(QStringLiteral("GEOMETERY"), QByteArray()).toByteArray());
      restoreState(settings.value(QStringLiteral("STATE")).toByteArray());
      settings.endGroup();
    }
    void closeEvent(QCloseEvent *event) override
    {
      QSettings settings(QStringLiteral("org"), QStringLiteral("test"));
      settings.beginGroup(QStringLiteral("GROUP"));
      settings.setValue(QStringLiteral("GEOMETERY"), saveGeometry());
      settings.setValue(QStringLiteral("STATE"), saveState());
      settings.endGroup();
    }
};

int main(int argc, char *argv[])
{
  QApplication app(argc, argv);
  MyTest mainWin;
  mainWin.show();
  return QApplication::exec();
}