Steps to reproduce:

1. Create a new Unity project using the Universal 2D template
2. Create a new Sprite Asset (Assets > Create > 2D > Sprites > Triangle)
3. Select the Triangle Asset in the Project window
4. Click the "Open Sprite Editor" button in the Inspector window
5. Click to open the "Toggle Sprite Editor locks" dropdown
6. Resize the Sprite Editor window while the "Toggle Sprite Editor locks" dropdown is active/opened

Actual results: When resizing the dropdown moves outside of the Sprite Editor window

Expected results: When resizing either the dropdown is closed/inactive or is contained inside the Sprite Editor window 

Reproducible with versions: 6000.1.9f1, 6000.2.0b8, 6000.3.0a1

Tested on (OS): macOS Silicon Sequoia 15.5

Notes:

• Also reproduces with the "Slice" dropdown
• Does not reproduce with the "Sprite Editor" dropdown, the dropdown instantly closes when the mouse clicks somewhere else
• Having different functionality for closing the dropdown on multiple dropdowns in the same window is inconsistent. The dropdowns should function the same.

Added Notes:

- This happens to all popup windows in Unity Editor eg Gizmo Popup window in Sceneview, Free Aspect Popup window in GameView.