Dropdown icon overlaps with its text when Vector 2 and Vector 3 option is selected under Event Attributes list from VFX Event Tester window in the Scene View, refer attached screenshot

Steps to repro:
1. Create a new project
2. Windows > Package Manager > Visual Effects Graph > Install
3. Hierarchy > create > Visual Effects > Visual Effect
4. Scene View > Event Attributes > Choose to add to list dropdown > Standard > Position
5. Select Vector 2 or Vector 3 option from the dropdown

Actual Result:
Dropdown icon overlaps with its text when Vector 2 and Vector 3 options are selected

Expected Result:
Dropdown icon doesn't overlap with its text

Note: VFX Graph introduced in Unity 2019.3.0a10 with Package Version 7.0.0

Reproducible in:
2020.1.0a14, 2019.3.0b12

Package Version found: 7.1.5, 7.1.2, 7.0.1, 7.0.0

Environment:
Windows 10 & macOS 10.14