Fix data collection message at app start

plugins/SliceInfoPlugin/SliceInfo.py

@@ -33,30 +33,35 @@ class SliceInfo(QObject, Extension):
     def __init__(self, parent = None):
         QObject.__init__(self, parent)
         Extension.__init__(self)
-        Application.getInstance().getOutputDeviceManager().writeStarted.connect(self._onWriteStarted)
-        Application.getInstance().getPreferences().addPreference("info/send_slice_info", True)
-        Application.getInstance().getPreferences().addPreference("info/asked_send_slice_info", False)
+
+        self._application = Application.getInstance()
+
+        self._application.getOutputDeviceManager().writeStarted.connect(self._onWriteStarted)
+        self._application.getPreferences().addPreference("info/send_slice_info", True)
+        self._application.getPreferences().addPreference("info/asked_send_slice_info", False)
 
         self._more_info_dialog = None
         self._example_data_content = None
 
-        if not Application.getInstance().getPreferences().getValue("info/asked_send_slice_info"):
+        self._application.initializationFinished.connect(self._onAppInitialized)
+
+    def _onAppInitialized(self):
+        # DO NOT read any preferences values in the constructor because at the time plugins are created, no version
+        # upgrade has been performed yet because version upgrades are plugins too!
+        if not self._application.getPreferences().getValue("info/asked_send_slice_info"):
             self.send_slice_info_message = Message(catalog.i18nc("@info", "Cura collects anonymized usage statistics."),
                                                    lifetime = 0,
                                                    dismissable = False,
                                                    title = catalog.i18nc("@info:title", "Collecting Data"))
 
             self.send_slice_info_message.addAction("MoreInfo", name = catalog.i18nc("@action:button", "More info"), icon = None,
-                    description = catalog.i18nc("@action:tooltip", "See more information on what data Cura sends."), button_style = Message.ActionButtonStyle.LINK)
+                                                   description = catalog.i18nc("@action:tooltip", "See more information on what data Cura sends."), button_style = Message.ActionButtonStyle.LINK)
 
             self.send_slice_info_message.addAction("Dismiss", name = catalog.i18nc("@action:button", "Allow"), icon = None,
-                    description = catalog.i18nc("@action:tooltip", "Allow Cura to send anonymized usage statistics to help prioritize future improvements to Cura. Some of your preferences and settings are sent, the Cura version and a hash of the models you're slicing."))
+                                                   description = catalog.i18nc("@action:tooltip", "Allow Cura to send anonymized usage statistics to help prioritize future improvements to Cura. Some of your preferences and settings are sent, the Cura version and a hash of the models you're slicing."))
             self.send_slice_info_message.actionTriggered.connect(self.messageActionTriggered)
             self.send_slice_info_message.show()
 
-        Application.getInstance().initializationFinished.connect(self._onAppInitialized)
-
-    def _onAppInitialized(self):
         if self._more_info_dialog is None:
             self._more_info_dialog = self._createDialog("MoreInfoWindow.qml")