Summary:
The diagnostics controller is not the best crafted UIViewController. It has many things that should be improved.
- This diff just sets the background of the root view to white. At least, that will ensure that its text content is always shown if the screen background happens to be black (same as font colour).
- Correct offset calculation, used for scrolling. Effectively, only set it if the content to be displayed no longer fits in the scrollview viewport.
Reviewed By: LukeDefeo
Differential Revision: D41876904
fbshipit-source-id: e2a89d8f6001e5b626c8df1d0832e77783999b81
8dd5b57444