DataGrids have absolutely positioned hidden divs with overflow: scroll, which can cause issue #2 from the linked bug above. And since they may be absolutely positioned in a layout, if issue #1 hasn't occurred elsewhere on the page, DataGrids may create issue #1 instead.
Also, ScrollPanel, which our developers rely on heavily is a good example of a div that will get absolutely positioned and have overflow: auto, and depending on content probably have in-flow elements that will require scrolling, and will contain at least one absolutely position div, since many GWT widgets have a hidden one. This will cause issue #1.