Fix #13180: don't delegate into SVG <use>

(cherry picked from commits 36457cb6..f860e0bd)

src/event.js

@@ -331,11 +331,10 @@ jQuery.event = {
 		// Make a writable jQuery.Event from the native event object
 		event = jQuery.event.fix( event );
 
-		var i, j, cur, ret, selMatch, matched, matches, handleObj, sel,
+		var i, j, ret, matched, handleObj,
 			handlerQueue = [],
 			args = core_slice.call( arguments ),
 			handlers = ( jQuery._data( this, "events" ) || {} )[ event.type ] || [],
-			delegateCount = handlers.delegateCount,
 			special = jQuery.event.special[ event.type ] || {};
 
 		// Use the fix-ed jQuery.Event rather than the (read-only) native event
@@ -347,41 +346,8 @@ jQuery.event = {
 			return;
 		}
 
-		// Determine handlers that should run if there are delegated events
-		// Avoid non-left-click bubbling in Firefox (#3861)
-		if ( delegateCount && !(event.button && event.type === "click") ) {
-
-			for ( cur = event.target; cur != this; cur = cur.parentNode || this ) {
-
-				// Ignore clicks (ONLY) on disabled elements (#6911, #8165, #11382, #11764)
-				if ( cur.disabled !== true || event.type !== "click" ) {
-					selMatch = {};
-					matches = [];
-					i = 0;
-					for ( ; i < delegateCount; i++ ) {
-						handleObj = handlers[ i ];
-						sel = handleObj.selector;
-
-						if ( selMatch[ sel ] === undefined ) {
-							selMatch[ sel ] = handleObj.needsContext ?
-								jQuery( sel, this ).index( cur ) >= 0 :
-								jQuery.find( sel, this, null, [ cur ] ).length;
-						}
-						if ( selMatch[ sel ] ) {
-							matches.push( handleObj );
-						}
-					}
-					if ( matches.length ) {
-						handlerQueue.push({ elem: cur, handlers: matches });
-					}
-				}
-			}
-		}
-
-		// Add the remaining (directly-bound) handlers
-		if ( handlers.length > delegateCount ) {
-			handlerQueue.push({ elem: this, handlers: handlers.slice( delegateCount ) });
-		}
+		// Determine handlers
+		handlerQueue = jQuery.event.handlers.call( this, event, handlers );
 
 		// Run delegates first; they may want to stop propagation beneath us
 		i = 0;
@@ -419,6 +385,50 @@ jQuery.event = {
 		return event.result;
 	},
 
+	handlers: function( event, handlers ) {
+		var i, matches, sel, handleObj,
+			handlerQueue = [],
+			delegateCount = handlers.delegateCount,
+			cur = event.target;
+
+		// Find delegate handlers
+		// Black-hole SVG <use> instance trees (#13180)
+		// Avoid non-left-click bubbling in Firefox (#3861)
+		if ( delegateCount && cur.nodeType && (!event.button || event.type !== "click") ) {
+
+			for ( ; cur != this; cur = cur.parentNode || this ) {
+
+				// Don't process clicks on disabled elements (#6911, #8165, #11382, #11764)
+				if ( cur.disabled !== true || event.type !== "click" ) {
+					matches = [];
+					for ( i = 0; i < delegateCount; i++ ) {
+						handleObj = handlers[ i ];
+						sel = handleObj.selector;
+
+						if ( matches[ sel ] === undefined ) {
+							matches[ sel ] = handleObj.needsContext ?
+								jQuery( sel, this ).index( cur ) >= 0 :
+								jQuery.find( sel, this, null, [ cur ] ).length;
+						}
+						if ( matches[ sel ] ) {
+							matches.push( handleObj );
+						}
+					}
+					if ( matches.length ) {
+						handlerQueue.push({ elem: cur, handlers: matches });
+					}
+				}
+			}
+		}
+
+		// Add the remaining (directly-bound) handlers
+		if ( delegateCount < handlers.length ) {
+			handlerQueue.push({ elem: this, handlers: handlers.slice( delegateCount ) });
+		}
+
+		return handlerQueue;
+	},
+
 	// Includes some event props shared by KeyEvent and MouseEvent
 	props: "altKey bubbles cancelable ctrlKey currentTarget eventPhase metaKey relatedTarget shiftKey target timeStamp view which".split(" "),
 

test/unit/event.js

@@ -1231,17 +1231,21 @@ test(".trigger() doesn't bubble load event (#10717)", function() {
 	jQuery( window ).off( "load" );
 });
 
-test("Delegated events in SVG (#10791)", function() {
+test("Delegated events in SVG (#10791; #13180)", function() {
 	expect(2);
 
-	var svg = jQuery(
+	var e,
+		svg = jQuery(
 			"<svg height='1' version='1.1' width='1' xmlns='http://www.w3.org/2000/svg'>" +
+			"<defs><rect id='ref' x='10' y='20' width='100' height='60' r='10' rx='10' ry='10'></rect></defs>" +
 			"<rect class='svg-by-class' x='10' y='20' width='100' height='60' r='10' rx='10' ry='10'></rect>" +
 			"<rect id='svg-by-id' x='10' y='20' width='100' height='60' r='10' rx='10' ry='10'></rect>" +
+			"<use id='use' xlink:href='#ref'></use>" +
 			"</svg>"
-		).appendTo( "body" );
+		);
 
-	jQuery( "body" )
+	jQuery("#qunit-fixture")
+		.append( svg )
 		.on( "click", "#svg-by-id", function() {
 			ok( true, "delegated id selector" );
 		})
@@ -1249,11 +1253,18 @@ test("Delegated events in SVG (#10791)", function() {
 			ok( true, "delegated class selector" );
 		})
 		.find( "#svg-by-id, [class~='svg-by-class']" )
-			.trigger( "click" )
-		.end()
-		.off( "click" );
+			.trigger("click")
+		.end();
+
+	// Fire a native click on an SVGElementInstance (the instance tree of an SVG <use>)
+	// to confirm that it doesn't break our event delegation handling (#13180)
+	if ( document.createEvent ) {
+		e = document.createEvent("MouseEvents");
+		e.initEvent( "click", true, true );
+		svg.find("#use")[0].instanceRoot.dispatchEvent( e );
+	}
 
-	svg.remove();
+	jQuery("#qunit-fixture").off("click");
 });
 
 test("Delegated events in forms (#10844; #11145; #8165; #11382, #11764)", function() {