Fix import of BOY files that carry no widget version=1.0.0

Author: kasemir

app/display/model/src/main/java/org/csstudio/display/builder/model/Widget.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015-2016 Oak Ridge National Laboratory.
+ * Copyright (c) 2015-2022 Oak Ridge National Laboratory.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -80,6 +80,9 @@ public class Widget
      */
     public static final Version BASE_WIDGET_VERSION = new Version(2, 0, 0);
 
+    /** Typical version of legacy BOY display widgets */
+    public static final Version TYPICAL_LEGACY_WIDGET_VERSION = new Version(1, 0, 0);
+
     // These user data keys are reserved for internal use
     // of the framework.
     //

app/display/model/src/main/java/org/csstudio/display/builder/model/persist/ModelReader.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2015-2020 Oak Ridge National Laboratory.
+ * Copyright (c) 2015-2022 Oak Ridge National Laboratory.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -362,7 +362,18 @@ private static Version readVersion(final Element element)
     {
         final String text = element.getAttribute(XMLTags.VERSION);
         if (text.isEmpty())
+        {
+            // Does widget look like a legacy widget without a type?
+            // Then assume 1.0.0
+            if (element.getAttribute(XMLTags.TYPE).isEmpty() &&
+                element.getAttribute("typeId") != null  &&
+                element.getAttribute("typeId").startsWith("org.csstudio.opibuilder.widgets."))
+                return Widget.TYPICAL_LEGACY_WIDGET_VERSION;
+
+            // Otherwise assume it's a new version but created by a script or manually
+            // so didn't bother to populate more than absolutely necessary
             return Widget.BASE_WIDGET_VERSION;
+        }
         return Version.parse(text);
     }
 }