How to reproduce:
1. Open attached project "Case_1131012_repro.zip"
2. Select "ArrayObject" GameObject in the hierarchy
3. In the Inspector, scroll down, so some of the array elements, in the beginning, are not visible
4. Click on the any of the fields of the elements

Expected result: Field, which is behind the mouse cursor is selected
Actual result: Selected field is not the one which is behind the mouse cursor

Reproducible with - 2019.1.0a11, 2019.1.0b5, 2019.2.0a6
Not reproducible with - 2017.4.21f1, 2018.3.7f1, 2019.1.0a10

Notes: Offset is determined by how many elements at the beginning of the array are hidden. If X elements are hidden, selection will be offset by X.