Bug 161828 [Undo] - second undo on folder move/copy merge restores old snapshot
Project A folder file1 file2 file3 file4 subfolder file1 file2 file3 file4 Move the "folder" to this existing project: Project B folder file1 file2 file3 file4 file5 file6 subfolder file1 file2 file3 file4 The move operation correctly replaces the content of file1, file2, file3, file4 in the ProjectB folder and the content of file1, file2, file3, file4 in the subfolder. Undo the move. The files return to their original location in ProjectA, and the content of the files in ProjectB have reverted to their content before the move. Redo the move. Everything still fine. Undo the move. Now the files have returned to their original location in ProjectA, but the content of the files in ProjectB still have the content from the ProjectA files.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/ide/undo/WorkspaceUndoUtil.java
existingFile.setContents(file.getContents(),
						IResource.KEEP_HISTORY, new SubProgressMonitor(monitor,
								1));
				fileDescription.recordLastHistory(existingFile,
						new SubProgressMonitor(monitor, 1));
				
				
				
				
				if (deleteSourceFile) {
					file.delete(IResource.KEEP_HISTORY, new SubProgressMonitor(
							monitor, 1));
				}
				monitor.done();
				return fileDescription;
			}
		}
		monitor.done();
		return null;
	}
	/*
	 * Check for existence of the specified path and generate any containers
	 * that do not yet exist. Return any generated containers, or null if no
	 * container had to be generated.
	 */
	private static IContainer generateContainers(IPath path)
			throws CoreException {
		IResource container;
		if (path.segmentCount() == 0) {