Bug 267173 [Linked Resources] Data loss when replacing one linked resource with another using drag and drop
Build ID: HEAD Steps To Reproduce: I've got a Group with some links to folders. If I drag and drop a linked folder from another workspace path, into the group, I get the dialog saying: "project/group/linked_folder" already exists. Do you wish to overwrite? Folder contents will be merged existing files will be overwritten. In my case I had selected a bunch of linked resources to drag into the group, (some of which are identical to the links already in the group). So I pressed "Yes To All". The result is an error: "Resource is out of sync with the filesystem: ..." The move operation has actually tried to replace a file with itself, and this fails (and the resulting file is empty...). I find this completely counter-intuitive. If I'm replacing a linked resource with another, I don't want a recursive merge. I want to replace the link, just like aliases in a filesystem...
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/ide/undo/WorkspaceUndoUtil.java
List resourcesAtDestination, List reverseDestinations,
			IProgressMonitor monitor, IAdaptable uiInfo,
			boolean pathIncludesName) throws CoreException {
		monitor.beginTask("", resources.length); 
		monitor
				.setTaskName(UndoMessages.AbstractResourcesOperation_MovingResources);
		List overwrittenResources = new ArrayList();
		for (int i = 0; i < resources.length; i++) {
			IResource source = resources[i];
			IPath destinationPath;
			if (pathIncludesName) {
				destinationPath = destination;
			} else {
				destinationPath = destination.append(source.getName());
			}
			IWorkspaceRoot workspaceRoot = getWorkspaceRoot();
			IResource existing = workspaceRoot.findMember(destinationPath);
			if (source.getType() == IResource.FOLDER && existing != null) {
				
				
				if (source.isLinked() == existing.isLinked()) {
					IResource[] children = ((IContainer) source).members();
					ResourceDescription[] overwritten = move(children,
							destinationPath, resourcesAtDestination,
							reverseDestinations, new SubProgressMonitor(
									monitor, 1), uiInfo, false);
					
					
					for (int j = 0; j < overwritten.length; j++) {
						overwrittenResources.add(overwritten[j]);