This has no effect if this compilation unit was not in working copy mode.
If {@link #becomeWorkingCopy(IProgressMonitor)} method was called severaltimes on this compilation unit, {@link #discardWorkingCopy()} must be calledas many times before it switches back to the original mode. Same as for method {@link #getWorkingCopy(IProgressMonitor)}.
@throws JavaModelException if this working copy could not return in its original mode. @see #becomeWorkingCopy(IProblemRequestor,IProgressMonitor) @since 3.0
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