Superfluous Scroll Bar in Unreal Project Browser

Resizing the Unreal Project Browser so all projects do not fit in the preview plane results in a second, "inner" scroll bar that does not function as a scroll bar.

Instead, attempting to scroll with it results in the bar disappearing and returning the window to it's properly functioning state.

Regression: this does not happen with previous versions of the Engine.

1. Launch UE4.12p5 from the Launcher library
2. Resize Unreal Project Browser Window so that not all Projects fit (See attached image)
   RESULT: A second, non-functional scroll bar will generate (See attached image)
   EXPECTED: Rather than this scroll bar appearing, the first bar should function to allow user to scroll down to projects that do not initially fit in the window.