Store inter-group linked-item relations with target, not source, library

User may not have write access to source library

chrome/content/zotero/xpcom/attachments.js

@@ -1251,7 +1251,7 @@ Zotero.Attachments = new function(){
 			Zotero.File.copyDirectory(dir, newDir);
 		}
 		
-		attachment.addLinkedItem(newAttachment);
+		newAttachment.addLinkedItem(attachment);
 		return newAttachment.id;
 	}
 	

chrome/content/zotero/xpcom/collectionTreeView.js

@@ -1429,7 +1429,7 @@ Zotero.CollectionTreeView.prototype.drop = function(row, orient)
 		//var newItem = Zotero.Items.get(id);
 		
 		// Record link
-		item.addLinkedItem(newItem);
+		newItem.addLinkedItem(item);
 		var newID = id;
 		
 		if (item.isNote()) {
@@ -1452,7 +1452,7 @@ Zotero.CollectionTreeView.prototype.drop = function(row, orient)
 				newNote.setSource(newItem.id);
 				newNote.save();
 				
-				note.addLinkedItem(newNote);
+				newNote.addLinkedItem(note);
 			}
 		}
 		

chrome/content/zotero/xpcom/data/item.js

@@ -4006,9 +4006,10 @@ Zotero.Item.prototype.addLinkedItem = function (item) {
 		return false;
 	}
 	
-	// If both group libraries, store relation with source group.
-	// Otherwise, store with personal library.
-	var libraryID = (this.libraryID && item.libraryID) ? this.libraryID : null;
+	// If one of the items is a personal library, store relation with that.
+	// Otherwise, use current item's library (which in calling code is the
+	// new, copied item).
+	var libraryID = (!this.libraryID || !item.libraryID) ? null : this.libraryID;
 	
 	Zotero.Relations.add(libraryID, url1, predicate, url2);
 }

chrome/content/zotero/xpcom/data/relation.js

@@ -158,6 +158,8 @@ Zotero.Relation.prototype.save = function () {
 		throw ("Missing object in Zotero.Relation.save()");
 	}
 	
+	Zotero.Relations.editCheck(this);
+	
 	var sql = "INSERT INTO relations "
 				+ "(libraryID, subject, predicate, object, clientDateModified) "
 				+ "VALUES (?, ?, ?, ?, ?)";