Moved calculating UCP only to Preread and getting value here

CURA-11403

cura/CuraActions.py

@@ -1,6 +1,5 @@
 # Copyright (c) 2023 UltiMaker
 # Cura is released under the terms of the LGPLv3 or higher.
-import zipfile
 from typing import List, cast
 
 from PyQt6.QtCore import QObject, QUrl, pyqtSignal, pyqtProperty
@@ -33,8 +32,6 @@ from cura.Operations.SetBuildPlateNumberOperation import SetBuildPlateNumberOper
 from UM.Logger import Logger
 from UM.Scene.SceneNode import SceneNode
 
-USER_SETTINGS_PATH = "Cura/user-settings.json"
-
 class CuraActions(QObject):
     def __init__(self, parent: QObject = None) -> None:
         super().__init__(parent)
@@ -196,13 +193,6 @@ class CuraActions(QObject):
             operation.addOperation(SetObjectExtruderOperation(node, extruder_id))
         operation.push()
 
-    @pyqtSlot(str, result = bool)
-    def isProjectUcp(self, file_url) -> bool:
-        file_name = QUrl(file_url).toLocalFile()
-        archive = zipfile.ZipFile(file_name, "r")
-        cura_file_names = [name for name in archive.namelist() if name.startswith("Cura/")]
-        return USER_SETTINGS_PATH in cura_file_names
-
     @pyqtSlot(int)
     def setBuildPlateForSelection(self, build_plate_nr: int) -> None:
         Logger.log("d", "Setting build plate number... %d" % build_plate_nr)

cura/CuraApplication.py

@@ -2194,6 +2194,12 @@ class CuraApplication(QtApplication):
     def addNonSliceableExtension(self, extension):
         self._non_sliceable_extensions.append(extension)
 
+    @pyqtSlot(str, result = bool)
+    def isProjectUcp(self, file_url) -> bool:
+        file_path = QUrl(file_url).toLocalFile()
+        workspace_reader = self.getWorkspaceFileHandler().getReaderForFile(file_path)
+        return workspace_reader.getIsProjectUcp()
+
     @pyqtSlot(str, result=bool)
     def checkIsValidProjectFile(self, file_url):
         """Checks if the given file URL is a valid project file. """

resources/qml/Cura.qml

@@ -702,7 +702,7 @@ UM.MainWindow
             if (hasProjectFile)
             {
                 var projectFile = projectFileUrlList[0]
-                var is_ucp = CuraActions.isProjectUcp(projectFile);
+                var is_ucp = CuraApplication.isProjectUcp(projectFile);
                 if (is_ucp)
                 {
                     askOpenAsProjectOrUcpOrImportModelsDialog.fileUrl = projectFile;
@@ -788,7 +788,7 @@ UM.MainWindow
         target: CuraApplication
         function onOpenProjectFile(project_file, add_to_recent_files)
         {
-            var is_ucp = CuraActions.isProjectUcp(project_file);
+            var is_ucp = CuraApplication.isProjectUcp(project_file);
             if (is_ucp)
             {