Enabling window animations causes dropdown menus to flicker and become unselectable

Not a regression as I was able to repro this in 4.25.4

The bug doesn't occur every single time, you may need to try disabling/re-enabling the setting and/or clicking on the menu dropdowns a few times. It happens more often that not though.

1. Open any project
2. Open 'Editor Preferences'
3. Search for and checkmark the "Enable Window Animations" setting
4. Click on any of the dropdown menus in the top right (File, Edit, Window, Help)

Result: Dropdown menu flickers and is unclickable

Expected: Dropdown menu looks and functions normally