Enabling window animations in the editor can cause dropdown windows to constantly reposition

Dropdowns do not reposition correctly in a details panel when window animations are enabled. With animations disabled, they'll reposition to stay attached to the field they are modifying.

1. Opened any project in the Editor (I used a new BP First Person)
2. Open Editor Preferences (Edit > Editor Preferences)
3. Search for "Window"
4. Under User Interface, enable Enable Window Animations
5. Click on the floor in the scene
6. In the details panel, click on the drop down for Static Mesh
7. Scroll up/down with the mouse focused on the details panel, not the drop down panel