Add scroll bar to the WorkSpaceDialog

The warning message took out some space from the dialog. Added a scroll bar to make sure the content can still be read.

CURA-6990

plugins/3MFReader/WorkspaceDialog.qml

@@ -31,10 +31,18 @@ UM.Dialog
         }
     }
 
+    Flickable
+    {
+        clip: true
+        width: parent.width
+        height: parent.height
+        contentHeight: dialogSummaryItem.height
+        ScrollBar.vertical: UM.ScrollBar { id: verticalScrollBar }
+
         Item
         {
             id: dialogSummaryItem
-        width: parent.width
+            width: verticalScrollBar.visible ? parent.width - verticalScrollBar.width - UM.Theme.getSize("default_margin").width : parent.width
             height: childrenRect.height
             anchors.margins: 10 * screenScaleFactor
 
@@ -441,6 +449,7 @@ UM.Dialog
                 }
             }
         }
+    }
 
     buttonWarningText: "The material used in this project is currently not installed in Cura.<br/>Install the material profile and reopen the project."
     buttonWarning: manager.missingPackages.length > 0