I have ben using the DiffTool class for a while. However recently it stopped working.
In the window, the left-hand gutter gets populated with diff bars,
but not the right-hand panel. It gets one bar at the top, which populates the gutter
when clicked on. Is DiffTool no longer supported?
"Most of you are familiar with the virtues of a programmer.
There are three, of course: laziness, impatience, and hubris."
- Larry Wall