Fix making an item a child item if it's in any collections

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

@@ -1409,7 +1409,7 @@ Zotero.Item.prototype._saveData = Zotero.Promise.coroutine(function* (env) {
 				let changedCollections = yield Zotero.DB.columnQueryAsync(sql, this.id);
 				if (changedCollections.length) {
 					let parentItem = yield this.ObjectsClass.getByLibraryAndKeyAsync(
-						this.libraryID, oldParentKey
+						this.libraryID, parentItemKey
 					)
 					for (let i=0; i<changedCollections.length; i++) {
 						yield parentItem.loadCollections();

test/tests/itemTest.js

@@ -204,6 +204,42 @@ describe("Zotero.Item", function () {
 			item.parentKey = false;
 			assert.isFalse(item.hasChanged());
 		});
+		
+		it("should move a top-level note under another item", function* () {
+			var noteItem = new Zotero.Item('note');
+			var id = yield noteItem.save()
+			noteItem = yield Zotero.Items.getAsync(id);
+			
+			var item = new Zotero.Item('book');
+			id = yield item.save();
+			var { libraryID, key } = Zotero.Items.getLibraryAndKeyFromID(id);
+			
+			noteItem.parentKey = key;
+			yield noteItem.save();
+			
+			assert.isFalse(noteItem.isTopLevelItem());
+		})
+		
+		it("should remove top-level item from collections when moving it under another item", function* () {
+			// Create a collection
+			var collection = new Zotero.Collection;
+			collection.name = "Test";
+			var collectionID = yield collection.save();
+			
+			// Create a top-level note and add it to a collection
+			var noteItem = new Zotero.Item('note');
+			noteItem.addToCollection(collectionID);
+			var id = yield noteItem.save()
+			noteItem = yield Zotero.Items.getAsync(id);
+			
+			var item = new Zotero.Item('book');
+			id = yield item.save();
+			var { libraryID, key } = Zotero.Items.getLibraryAndKeyFromID(id);
+			noteItem.parentKey = key;
+			yield noteItem.save();
+			
+			assert.isFalse(noteItem.isTopLevelItem());
+		})
 	});
 	
 	describe("#attachmentCharset", function () {