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
new SubProgressMonitor(monitor, 1));
							IResource[] members = ((IContainer) source)
									.members();
							if (members.length > 0) {
								overwrittenResources.addAll(Arrays.asList(copy(
										members, destinationPath,
										resourcesAtDestination,
										new SubProgressMonitor(monitor, 1),
										uiInfo, false, createVirtual,
										createLinks, relativeToVariable)));
							}
						} else
							folder.createLink(createRelativePath(source
									.getLocationURI(), relativeToVariable, folder), 0,
									new SubProgressMonitor(monitor, 1));
					} else
						source.copy(destinationPath, IResource.SHALLOW,
								new SubProgressMonitor(monitor, 1));
					
					resourcesAtDestination.add(getWorkspace().getRoot()
							.findMember(destinationPath));
					for (int j = 0; j < deleted.length; j++) {
						overwrittenResources.add(deleted[j]);
					}
				}
			} else {
				if (existing != null) {
					
					if ((createLinks || createVirtual)
							&& (source.isLinked() == false)) {