Remove hack in WelcomePagesModel and add WhatsNewPagesModel

CURA-6447

resources/qml/Actions.qml

@@ -61,6 +61,7 @@ Item
     property alias documentation: documentationAction;
     property alias showTroubleshooting: showTroubleShootingAction
     property alias reportBug: reportBugAction;
+    property alias whatsNew: whatsNewAction
     property alias about: aboutAction;
 
     property alias toggleFullScreen: toggleFullScreenAction;
@@ -229,6 +230,13 @@ Item
         onTriggered: CuraActions.openBugReportPage();
     }
 
+    Action
+    {
+        id: whatsNewAction;
+        text: catalog.i18nc("@action:inmenu menubar:help", "What's New");
+        iconName: "help-whats-new";
+    }
+
     Action
     {
         id: aboutAction;

resources/qml/Cura.qml

@@ -68,32 +68,54 @@ UM.MainWindow
         z: greyOutBackground.z + 1
     }
 
-    Component.onCompleted:
+    Connections
     {
-        CuraApplication.setMinimumWindowSize(UM.Theme.getSize("window_minimum_size"))
-        // Workaround silly issues with QML Action's shortcut property.
-        //
-        // Currently, there is no way to define shortcuts as "Application Shortcut".
-        // This means that all Actions are "Window Shortcuts". The code for this
-        // implements a rather naive check that just checks if any of the action's parents
-        // are a window. Since the "Actions" object is a singleton it has no parent by
-        // default. If we set its parent to something contained in this window, the
-        // shortcut will activate properly because one of its parents is a window.
-        //
-        // This has been fixed for QtQuick Controls 2 since the Shortcut item has a context property.
-        Cura.Actions.parent = backgroundItem
-        CuraApplication.purgeWindows()
+        target: CuraApplication
+        onInitializationFinished:
+        {
+            CuraApplication.setMinimumWindowSize(UM.Theme.getSize("window_minimum_size"))
+            // Workaround silly issues with QML Action's shortcut property.
+            //
+            // Currently, there is no way to define shortcuts as "Application Shortcut".
+            // This means that all Actions are "Window Shortcuts". The code for this
+            // implements a rather naive check that just checks if any of the action's parents
+            // are a window. Since the "Actions" object is a singleton it has no parent by
+            // default. If we set its parent to something contained in this window, the
+            // shortcut will activate properly because one of its parents is a window.
+            //
+            // This has been fixed for QtQuick Controls 2 since the Shortcut item has a context property.
+            Cura.Actions.parent = backgroundItem
+            CuraApplication.purgeWindows()
 
-        if (CuraApplication.getWelcomePagesModel().shouldShowWelcomeFlow)
-        {
-            welcomeDialogItem.visible = true
-        }
-        else
-        {
-            welcomeDialogItem.visible = false
+            if (CuraApplication.shouldShowWelcomeDialog())
+            {
+                welcomeDialogItem.visible = true
+            }
+            else
+            {
+                welcomeDialogItem.visible = false
+            }
+
+            if (CuraApplication.shouldShowWhatsNewDialog())
+            {
+                showWhatsNewDialogTimer.start()
+            }
         }
     }
 
+    // HACK: Use a timer here because if we call "Cura.Actions.whatsNew.trigger()" or "whatsNewDialog.show()" when
+    // the component gets completed or when the application finishes its initialization, the main window has not been
+    // fully initialized yet. If we should the dialog before the main window is fully initialized, you will see the
+    // dialog first but when the main windows is fully initialized, the dialog will disappear. Adding a timer here is
+    // to bypass this problem.
+    Timer
+    {
+        id: showWhatsNewDialogTimer
+        repeat: false
+        interval: 1000
+        onTriggered: Cura.Actions.whatsNew.trigger()
+    }
+
     Item
     {
         id: backgroundItem
@@ -780,6 +802,20 @@ UM.MainWindow
         progressBarVisible: false
     }
 
+    Cura.WizardDialog
+    {
+        id: whatsNewDialog
+        title: catalog.i18nc("@title:window", "What's New")
+        model: CuraApplication.getWhatsNewPagesModel()
+        progressBarVisible: false
+    }
+
+    Connections
+    {
+        target: Cura.Actions.whatsNew
+        onTriggered: whatsNewDialog.show()
+    }
+
     Connections
     {
         target: Cura.Actions.addMachine

resources/qml/MainWindow/ApplicationMenu.qml

@@ -101,6 +101,7 @@ Item
             MenuItem { action: Cura.Actions.documentation }
             MenuItem { action: Cura.Actions.reportBug }
             MenuSeparator { }
+            MenuItem { action: Cura.Actions.whatsNew }
             MenuItem { action: Cura.Actions.about }
         }
     }

resources/qml/WelcomePages/WhatsNewContent.qml

@@ -51,7 +51,7 @@ Item
         id: getStartedButton
         anchors.right: parent.right
         anchors.bottom: parent.bottom
-        text: catalog.i18nc("@button", "Next")
+        text: base.currentItem.next_page_button_text
         onClicked: base.showNextPage()
     }
 }