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
return WorkbenchPlugin.getDefault().getOperationSupport()
				.getUndoContext();
	}
	/**
	 * Return the undo context that should be used for operations involving
	 * tasks.
	 * 
	 * @return the tasks undo context
	 */
	public static IUndoContext getTasksUndoContext() {
		if (tasksUndoContext == null) {
			tasksUndoContext = new ObjectUndoContext(new Object(),
					"Tasks Context"); 
			tasksUndoContext.addMatch(getWorkspaceUndoContext());
		}
		return tasksUndoContext;
	}
	/**
	 * Return the undo context that should be used for operations involving
	 * bookmarks.
	 * 
	 * @return the bookmarks undo context
	 */
	public static IUndoContext getBookmarksUndoContext() {
		if (bookmarksUndoContext == null) {
			bookmarksUndoContext = new ObjectUndoContext(new Object(),
					"Bookmarks Context"); 
			bookmarksUndoContext.addMatch(getWorkspaceUndoContext());
		}
		return bookmarksUndoContext;