Added 'noChildren' search condition and switched main items view to always use a search rather than getItems(), for reasons that will become clear soon

chrome/content/zotero/xpcom/collectionTreeView.js

@@ -669,9 +669,9 @@ Zotero.ItemGroup.prototype.getName = function()
 
 Zotero.ItemGroup.prototype.getChildItems = function()
 {
-	if(this.searchText)
-	{
-		var s = new Zotero.Search();
+	var s = new Zotero.Search();
+	
+	if (this.searchText){
 		if (this.isCollection())
 		{
 			s.addCondition('collectionID', 'is', this.ref.getID(), true);
@@ -681,23 +681,26 @@ Zotero.ItemGroup.prototype.getChildItems = function()
 			s.addCondition('savedSearchID', 'is', this.ref['id'], true);
 		}
 		s.addCondition('quicksearch', 'contains', this.searchText);
-		return Zotero.Items.get(s.search());
 	}
 	else
 	{
-		if(this.isCollection())
-			return Zotero.getItems(this.ref.getID());
-		else if(this.isLibrary())
-			return Zotero.getItems();
-		else if(this.isSearch())
-		{
-			var s = new Zotero.Search();
-			s.load(this.ref['id']);
-			return Zotero.Items.get(s.search());
+		if (this.isLibrary()){
+			s.addCondition('noChildren', 'true');
 		}
-		else
+		else if (this.isCollection()){
+			s.addCondition('noChildren', 'true');
+			s.addCondition('collectionID', 'is', this.ref.getID());
+		}
+		else if (this.isSearch()){
+			s.load(this.ref['id']);
+		}
+		else {
 			return null;
+		}
 	}
+	
+	var ids = s.search();
+	return Zotero.Items.get(ids);
 }
 
 Zotero.ItemGroup.prototype.setSearch = function(searchText)

chrome/content/zotero/xpcom/search.js

@@ -361,11 +361,14 @@ Zotero.Search.prototype._buildQuery = function(){
 		// Handle special conditions
 		else {
 			switch (data['name']){
+				case 'noChildren':
+					var noChildren = this._conditions[i]['operator']=='true';
+				
 				// Search subfolders
 				case 'recursive':
 					var recursive = this._conditions[i]['operator']=='true';
 					continue;
-					
+				
 				// Join mode ('any' or 'all')
 				case 'joinMode':
 					var joinMode = this._conditions[i]['operator'].toUpperCase();
@@ -388,8 +391,20 @@ Zotero.Search.prototype._buildQuery = function(){
 		}
 	}
 	
+	if (noChildren){
+		sql += " WHERE (itemID NOT IN (SELECT itemID FROM itemNotes "
+			+ "WHERE sourceItemID IS NOT NULL) AND itemID NOT IN "
+			+ "(SELECT itemID FROM itemAttachments "
+			+ "WHERE sourceItemID IS NOT NULL))";
+	}
+		
 	if (hasConditions){
-		sql += " WHERE ";
+		if (noChildren){
+			sql += " AND ";
+		}
+		else {
+			sql += " WHERE ";
+		}
 		
 		for each(var condition in conditions){
 				var openParens = 0;
@@ -820,7 +835,16 @@ Zotero.SearchConditions = new function(){
 			// Special conditions
 			//
 			
-			// Search recursively
+			// Don't include child items
+			{
+				name: 'noChildren',
+				operators: {
+					true: true,
+					false: true
+				}
+			},
+			
+			// Search recursively within collections
 			{
 				name: 'recursive',
 				operators: {