Richard Brightwell's answer is correct, although he left me a little, as he went missing.
- Select a file from the project navigator, then click the version editor button (top right).
- Click the timeline icon between the two files to display a vertical bar representing revisions (a black bar with white indicators for each revision).
- Drag the white arrows in the version to compare.

Jason George Aug 05 '11 at 16:51 2011-08-05 16:51
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