Issue with row selection and scrolling

[alexrozanski]

Steps to reproduce:

1. Click on any row in the list view.
2. Click anywhere on the uppermost row of pixels for the selected row.
3. Try to scroll; it won't initially but will deselect then scroll again; move the mouse a bit then try again and it will.

Possibly related to drag and drop? On a couple of attempts I saw the green circle with a + which is shown when moving an item via drag and drop.

[chitoiup]

Verified that it's related to drag and drop by removing the attemptDragWithMouseDown function and everywhere it's called. Does not seem to have an adverse effect if your project does not use drag and drop.