Fix tag diffing

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

@@ -543,7 +543,9 @@ Zotero.DataObjects.prototype._diffCollections = function (data1, data2) {
 Zotero.DataObjects.prototype._diffTags = function (data1, data2) {
 	if (data1.length != data2.length) return false;
 	for (let i = 0; i < data1.length; i++) {
-		if (c1.tag !== c2.tag || (c1.type || 0) !== (c2.type || 0)) {
+		let t1 = data1[i];
+		let t2 = data2[i];
+		if (t1.tag !== t2.tag || (t1.type || 0) !== (t2.type || 0)) {
 			return false;
 		}
 	}

test/tests/dataObjectsTest.js

@@ -66,5 +66,45 @@ describe("Zotero.DataObjects", function() {
 			var diff = Zotero.Items.diff(json1, json2);
 			assert.isFalse(diff);
 		})
+		
+		it("should show tags of different types as different", function* () {
+			var json1 = {
+				tags: [
+					{
+						tag: "Foo"
+					}
+				]
+			};
+			var json2 = {
+				tags: [
+					{
+						tag: "Foo",
+						type: 1
+					}
+				]
+			};
+			var diff = Zotero.Items.diff(json1, json2);
+			assert.isFalse(diff);
+		})
+		
+		it("should not show manual tags as different without 'type' property", function* () {
+			var json1 = {
+				tags: [
+					{
+						tag: "Foo"
+					}
+				]
+			};
+			var json2 = {
+				tags: [
+					{
+						tag: "Foo",
+						type: 0
+					}
+				]
+			};
+			var diff = Zotero.Items.diff(json1, json2);
+			assert.isFalse(diff);
+		})
 	})
 })