Tested with the revision (from 4.7 branch): b92df717c0a07ad77b5662fea6f78e8a6a5ea693

There is a difference between how GridView and ListView treat its 'header'. GridView considers that it is "outside" the content, so to show the header, the contentY need to be negative if I want to see the header. On the other hand, ListView considers it "inside" the content, so when contentY is 0, the header is visible.

The attached example shows the difference, when loading only the header for the ListView is visible, and printing in the console the contentY for each View when dragging.

I considered that unexpected because looking at the documentation for both components, the text used for explaining 'header' property is the same. And no other mention about 'header'.