DYN-9707: Fix ForceBlockRun not applied when opening legacy XML workspaces (#17167)

Co-authored-by: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

Author: jasonstratton

src/DynamoCore/Models/DynamoModel.cs

@@ -2256,7 +2256,7 @@ internal void OpenFileFromPathCore(string filePath, bool forceManualExecutionMod
                     // When Json opening failed, either this file is corrupted or file might be XML
                     if (ex is JsonReaderException && DynamoUtilities.PathHelper.isValidXML(filePathToOpen, out xmlDoc, out ex))
                     {
-                        openedSuccessfully = OpenXmlFileFromPath(xmlDoc, filePathToOpen, forceManualExecutionMode);
+                        openedSuccessfully = OpenXmlFileFromPath(xmlDoc, filePathToOpen, forceManualExecutionMode, forceBlockRun: forceBlockRun);
                         return;
                     }
                     else
@@ -2465,8 +2465,9 @@ private void InsertJsonFileFromPath(string fileContents, string filePath, bool f
         /// <param name="forceManualExecutionMode">Set this to true to discard
         /// execution mode specified in the file and set manual mode</param>
         /// <param name="isTemplate">When true, marks the opened workspace as a template (for example when opened via <see cref="OpenTemplateFromPath"/>).</param>
+        /// <param name="forceBlockRun">Set this to true to block the graph from running after opening.</param>
         /// <returns>True if workspace was opened successfully</returns>
-        private bool OpenXmlFileFromPath(XmlDocument xmlDoc, string filePath, bool forceManualExecutionMode, bool isTemplate = false)
+        private bool OpenXmlFileFromPath(XmlDocument xmlDoc, string filePath, bool forceManualExecutionMode, bool isTemplate = false, bool forceBlockRun = false)
         {
             try
             {
@@ -2491,6 +2492,8 @@ private bool OpenXmlFileFromPath(XmlDocument xmlDoc, string filePath, bool force
                         if (OpenXmlFile(workspaceInfo, xmlDoc, out ws))
                         {
                             ws.IsTemplate = isTemplate;
+                            if (ws is HomeWorkspaceModel homeWs && homeWs.RunSettings != null)
+                                homeWs.RunSettings.ForceBlockRun = forceBlockRun;
                             OpenWorkspace(ws);
 
                             // Set up workspace cameras here