Add [is[tiddler]] filter operator

For selecting all non-shadow tiddlers, whether or not they are system
tiddlers

core/modules/filters/is/tiddler.js

@@ -0,0 +1,43 @@
+/*\
+title: $:/core/modules/filters/is/tiddler.js
+type: application/javascript
+module-type: isfilteroperator
+
+Filter function for [is[tiddler]]
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Export our filter function
+*/
+exports.tiddler = function(source,prefix,options) {
+	var results = [];
+	// Function to check a tiddler
+	function checkTiddler(title) {
+		var match = options.wiki.tiddlerExists(title);
+		if(prefix === "!") {
+			match = !match;
+		}
+		if(match) {
+			results.push(title);
+		}
+	};
+	// Iterate through the source tiddlers
+	if($tw.utils.isArray(source)) {
+		$tw.utils.each(source,function(title) {
+			checkTiddler(title);
+		});
+	} else {
+		$tw.utils.each(source,function(element,title) {
+			checkTiddler(title);
+		});
+	}
+	return results;
+};
+
+})();

editions/tw5.com/tiddlers/concepts/TiddlerFilters.tid

@@ -1,6 +1,6 @@
 created: 201308270800
 creator: JeremyRuston
-modified: 201309141606
+modified: 201311242006
 modifier: JeremyRuston
 tags: concepts
 title: TiddlerFilters
@@ -63,6 +63,7 @@ The operator defaults to `title` if omitted, so `[[HelloThere]]` is equivalent t
 
 The operands available with the `is` operator are:
 
+* ''tiddler'': selects all tiddlers excluding shadows, whether or not they are SystemTiddlers
 * ''system'': selects all SystemTiddlers
 * ''shadow'': selects all ShadowTiddlers
 * ''current'': selects the current ContextTiddler