Steps to reproduce:
1. Build any project on WebGL
2. Run the build
3. Resize the window so that the build area doesn't fit vertically
4. Observe the build area being cropped out, even though scroll bar shows being at the top

Expected: When the scroll bar is at the top, the window is scrolled to the top of the build area
Actual: The layout is defined incorrectly and thus the scrollbar does not go up to the extent of the build

Reproduced on: 5.5.4p3, 5.6.3f1, 2017.1.0p3, 2017.2.0b8, 2017.3.0a5