update caches if tiddler with tag has been deleted

core/modules/indexers/tag-indexer.js

@@ -38,20 +38,16 @@ TagIndexer.prototype.update = function(updateDescriptor) {
 	var newTid = updateDescriptor.new.tiddler;
 	var oldTid = updateDescriptor.old.tiddler;
 	var noOldTid = oldTid === undefined;
-	var noNewTid = newTid === undefined;
 
-	// Index should be kept when there is no new tiddler
-	if (noNewTid) {
-		return;	// early
-	} //  -> or
 	// a) new tiddler has no tags && no old tiddler -> or
-	// b) new tiddler has no tags && old tiddler has no tags
+	// b) new tiddler has no tags && old tiddler has no tags -> return early!
 	var a=((newTid && newTid.fields && newTid.fields.tags === undefined) && noOldTid),
 		b=((newTid && newTid.fields && newTid.fields.tags === undefined) && (oldTid && oldTid.fields && oldTid.fields.tags === undefined));
 
 	if( a || b ) {
-		return;
+		return; // early
 	}
+
 	$tw.utils.each(this.subIndexers,function(subIndexer) {
 		subIndexer.update(updateDescriptor);
 	});
@@ -73,6 +69,9 @@ TagSubIndexer.prototype.addIndexMethod = function() {
 TagSubIndexer.prototype.rebuild = function() {
 	var self = this;
 	// Hashmap by tag of array of {isSorted:, titles:[]}
+
+const t0 = $tw.utils.timer();
+
 	this.index = Object.create(null);
 	// Add all the tags
 	this.indexer.wiki[this.iteratorMethod](function(tiddler,title) {
@@ -84,6 +83,9 @@ TagSubIndexer.prototype.rebuild = function() {
 			}
 		});
 	});
+
+console.log("--------------- ", $tw.utils.timer(t0), this.iteratorMethod);
+
 };
 
 TagSubIndexer.prototype.update = function(updateDescriptor) {