Small UX fixes

resources/qml/PrivacyScreen.qml

@@ -18,7 +18,9 @@ Item {
                 screenSaverTimer.stop();
                 screenSaver.state = "Invisible";
             } else {
-                screenSaverTimer.start();
+                if (timelineRoot.visible) {
+                    screenSaverTimer.start();
+                }
             }
         }
     }

src/MainWindow.cpp

@@ -59,6 +59,8 @@ MainWindow::MainWindow(QWidget *parent)
   : QMainWindow(parent)
   , userSettings_{UserSettings::instance()}
 {
+        instance_ = this;
+
         setWindowTitle(0);
         setObjectName("MainWindow");
 
@@ -312,8 +314,6 @@ MainWindow::showChatPage()
                 &Cache::secretChanged,
                 userSettingsPage_,
                 &UserSettingsPage::updateSecretStatus);
-
-        instance_ = this;
 }
 
 void