Fix #12436, make delegated events fast again. Close gh-923.

Retains the rooted-at-delegateTarget behavior fixed in #12383 by afd717df9e.

diff --git a/src/event.js b/src/event.js
index 902b2b5ffaf875a34e432dc64ff7d61fd3f5d8c1..d4c17cf31ba0e7fc69542fc1e339c494fc2bfd38 100644 (file)
--- a/src/event.js
+++ b/src/event.js
@@ -81,6 +81,7 @@ jQuery.event = {
                                handler: handler,
                                guid: handler.guid,
                                selector: selector,
+                               needsContext: selector && jQuery.expr.match.needsContext.test( selector ),
                                namespace: namespaces.join(".")
                        }, handleObjIn );
 
@@ -393,7 +394,9 @@ jQuery.event = {
                                                sel = handleObj.selector;
 
                                                if ( selMatch[ sel ] === undefined ) {
-                                                       selMatch[ sel ] = jQuery( sel, this ).index( cur ) >= 0;
+                                                       selMatch[ sel ] = handleObj.needsContext ?
+                                                               jQuery( sel, this ).index( cur ) >= 0 :
+                                                               jQuery.find( sel, this, null, [ cur ] ).length;
                                                }
                                                if ( selMatch[ sel ] ) {
                                                        matches.push( handleObj );