We can move the construction of the Diff instance into the body of the
if statement, so that we only construct this if the condition is true.
While we're at it, we can move the symbol description string into the
instance, getting rid of a copy. The function itself can also be const
qualified.
Add Diff button to CodeWidget
Add Code Diff Tool window for recording and differencing functions. Allows finding specific functions based on when they run.