Only remember the folder for the next time if the dialog is accepted

If the dialog is not accepted then it should not remember the last
folder that was used. This should only happen if the user clicks on OK.

[ChangeLog][FileDialogs] Remember the folder only when the file dialog
is accepted.

Change-Id: I69957e56e887affcab9933562274013fee686063
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

src/dialogs/qquickplatformfiledialog.cpp

@@ -213,7 +213,6 @@ QPlatformFileDialogHelper *QQuickPlatformFileDialog::helper()
         if (!m_dlgHelper)
             return m_dlgHelper;
         m_dlgHelper->setOptions(m_options);
-        connect(m_dlgHelper, SIGNAL(directoryEntered(QUrl)), this, SLOT(updateFolder(QUrl)));
         connect(m_dlgHelper, SIGNAL(filterSelected(QString)), this, SIGNAL(filterSelected()));
         connect(m_dlgHelper, SIGNAL(accept()), this, SLOT(accept()));
         connect(m_dlgHelper, SIGNAL(reject()), this, SLOT(reject()));
@@ -222,6 +221,12 @@ QPlatformFileDialogHelper *QQuickPlatformFileDialog::helper()
     return m_dlgHelper;
 }
 
+void QQuickPlatformFileDialog::accept()
+{
+    updateFolder(folder());
+    QQuickFileDialog::accept();
+}
+
 /*!
     \qmlproperty bool FileDialog::visible
 

src/dialogs/qquickplatformfiledialog_p.h

@@ -67,6 +67,7 @@ public:
 
 protected:
     QPlatformFileDialogHelper *helper() Q_DECL_OVERRIDE;
+    virtual void accept() override;
 
     Q_DISABLE_COPY(QQuickPlatformFileDialog)
 };