refactor(widget): make PrivacyForm use signals for clearAllReceipts()

src/widget/form/settings/privacyform.cpp

@@ -59,7 +59,7 @@ void PrivacyForm::on_cbKeepHistory_stateChanged()
 {
     Settings::getInstance().setEnableLogging(bodyUI->cbKeepHistory->isChecked());
     if (!bodyUI->cbKeepHistory->isChecked()) {
-        Widget::getInstance()->clearAllReceipts();
+        emit clearAllReceipts();
         QMessageBox::StandardButton dialogDelHistory;
         dialogDelHistory =
             QMessageBox::question(nullptr, tr("Confirmation"),

src/widget/form/settings/privacyform.h

@@ -37,6 +37,9 @@ public:
         return tr("Privacy");
     }
 
+signals:
+    void clearAllReceipts();
+
 private slots:
     void on_cbKeepHistory_stateChanged();
     void on_cbTypingNotification_stateChanged();

src/widget/form/settingswidget.cpp

@@ -62,6 +62,8 @@ SettingsWidget::SettingsWidget(UpdateCheck* updateCheck, IAudioControl& audio, W
 
     std::unique_ptr<UserInterfaceForm> uifrm(new UserInterfaceForm(this));
     std::unique_ptr<PrivacyForm> pfrm(new PrivacyForm());
+    connect(pfrm.get(), &PrivacyForm::clearAllReceipts, parent, &Widget::clearAllReceipts);
+
     AVForm* rawAvfrm = new AVForm(audio, coreAV, camera, audioSettings, videoSettings);
     std::unique_ptr<AVForm> avfrm(rawAvfrm);
     std::unique_ptr<AdvancedForm> expfrm(new AdvancedForm());