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Cannot mouse scroll trough list exceeding screen heights when using Custom Inspector Script



1. Open the attached project and "Repro" scene
2. Go to Example --> Scroll
3. Press on a "Cube" Dropdown button

Expected result: List of items shows up, you can mouse scroll trough the items
Actual result: List of items shows up, you cannot mouse scroll trough the items

Reproducible with - 2017.3.0a7, 2017.2.0b11, 2017.1.1p1

This is by design, Unity does not have control over how the OS handles input for it’s native popups. The issue is reproducible on Windows, it is not reproducible on macOS or Linux. As a workaround, Popup window with a Scroll View can be used

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