How to reproduce:
1. Create a new project
2. In the Project window, click the right mouse button > Create > Bolt / Visual Scripting > Flow Macro / Script Graph
3. Open the created Flow macro / Script Graph
4. Add a Node that has a drop-down menu, for example: right-click into an empty space > Events > Input > On Button Input
5. Zoom out so you can still see the drop-down menu button
6. Open the drop-down menu on the Node

Expected result: drop-down menu opens at the Node's location on-screen
Actual result: drop-down menu opens at a different location on-screen than the Node is at

Reproducible with: Bolt 1.4.13 (2018.4.33f1, 2019.4.23f1, 2020.3.2f1, 2021.1.0f1, 2021.2.0a10), Visual Scripting 1.5.2-release (2021.1.0f1, 2021.2.0a10)

Note from [~philip]:
Could you explain why we need a offset? If you need to position the pop up there is EditorGUI.EnumPopup() to accomplish what you need. All EditorGUILayout.enumpopup does is pass `Rect r = s_LastRect = GetControlRect(false, EditorGUI.kSingleLineHeight, style, options);` to the EditorGUI version. You could get that information and then apply any offset you want.

Issue with adding a offset to this one call would be that we would need to add it everywhere else which wont happen.