Android: hide() in the QAndroidPlatformMessageDialogHelper destructor

The native dialog window is not being hidden or destroyed when the
QAndroidPlatformMessageDialogHelper object is destroyed. This makes
sure to not leave any native dialogs open.

Pick-to: 6.2 6.3 6.3.0
Task-number: QTBUG-97482
Fixes: QTBUG-101758
Change-Id: I2e50caebd286ea6abd3e948a4873dc3c971626a4
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

src/plugins/platforms/android/qandroidplatformdialoghelpers.cpp

@@ -60,6 +60,11 @@ QAndroidPlatformMessageDialogHelper::QAndroidPlatformMessageDialogHelper()
 {
 }
 
+QAndroidPlatformMessageDialogHelper::~QAndroidPlatformMessageDialogHelper()
+{
+    hide();
+}
+
 void QAndroidPlatformMessageDialogHelper::exec()
 {
     if (!m_shown)

src/plugins/platforms/android/qandroidplatformdialoghelpers.h

@@ -57,6 +57,8 @@ class QAndroidPlatformMessageDialogHelper: public QPlatformMessageDialogHelper
     Q_OBJECT
 public:
     QAndroidPlatformMessageDialogHelper();
+    ~QAndroidPlatformMessageDialogHelper();
+
     void exec() override;
     bool show(Qt::WindowFlags windowFlags,
               Qt::WindowModality windowModality,