docs: public Project duplicate() {
          Project dup = new Project();
          dup.currentWorkingDirectoryList.addAll(this.currentWorkingDirectoryList);
          dup.projectName = this.projectName;
          dup.analysisTargets.addAll(this.analysisTargets);
          dup.srcDirList.addAll(this.srcDirList);
          dup.auxClasspathEntryList.addAll(this.auxClasspathEntryList);
          dup.timestampForAnalyzedClasses = timestampForAnalyzedClasses;
          dup.guiCallback = guiCallback;
          return dup;
      }