Fixes #12736. Move hover event hack to deprecated.js for removal in 1.9. Closes gh-982.

Signed-off-by: Timmy Willison <timmywillisn@gmail.com>

src/deprecated.js

 // Limit scope pollution from any deprecated API
 (function() {
 
-var matched, browser;
+var matched, browser, eventAdd, eventRemove,
+	oldToggle = jQuery.fn.toggle,
+	rhoverHack = /(?:^|\s)hover(\.\S+|)\b/,
+	hoverHack = function( events ) {
+		return jQuery.event.special.hover ? events : events.replace( rhoverHack, "mouseenter$1 mouseleave$1" );
+	};
 
 // Use of jQuery.browser is frowned upon.
 // More details: http://api.jquery.com/jQuery.browser
@@ -60,10 +65,6 @@ jQuery.sub = function() {
 	return jQuerySub;
 };
 
-// Unused in 1.8, left in so attrFn-stabbers won't die; remove in 1.9
-jQuery.attrFn = {};
-
-var oldToggle = jQuery.fn.toggle;
 jQuery.fn.toggle = function( fn, fn2 ) {
 
 	if ( !jQuery.isFunction( fn ) || !jQuery.isFunction( fn2 ) ) {
@@ -95,4 +96,32 @@ jQuery.fn.toggle = function( fn, fn2 ) {
 	return this.click( toggler );
 };
 
+
+// Support for 'hover' type
+eventAdd = jQuery.event.add;
+
+//	Duck punch jQuery.event.add, and jquery.event.remove
+//	Signatures:
+//	jQuery.event = {
+//	add: function( elem, types, handler, data, selector ) {
+//	remove: function( elem, types, handler, selector, mappedTypes ) {
+jQuery.event.add = function( elem, types, handler, data, selector ){
+	if ( types ) {
+		types = hoverHack( types );
+	}
+	eventAdd.call( this, elem, types, handler, data, selector );
+};
+
+eventRemove = jQuery.event.remove;
+
+jQuery.event.remove = function( elem, types, handler, selector, mappedTypes ){
+	if ( types ) {
+		types = hoverHack( types );
+	}
+	eventRemove.call( this, elem, types, handler, selector, mappedTypes );
+};
+
+// Unused in 1.8, left in so attrFn-stabbers won't die; remove in 1.9
+jQuery.attrFn = {};
+
 })();

src/event.js

 var rformElems = /^(?:textarea|input|select)$/i,
 	rtypenamespace = /^([^\.]*|)(?:\.(.+)|)$/,
-	rhoverHack = /(?:^|\s)hover(\.\S+|)\b/,
 	rkeyEvent = /^key/,
 	rmouseEvent = /^(?:mouse|contextmenu)|click/,
-	rfocusMorph = /^(?:focusinfocus|focusoutblur)$/,
-	hoverHack = function( events ) {
-		return jQuery.event.special.hover ? events : events.replace( rhoverHack, "mouseenter$1 mouseleave$1" );
-	};
+	rfocusMorph = /^(?:focusinfocus|focusoutblur)$/;
 
 /*
  * Helper functions for managing events -- not part of the public interface.
@@ -56,7 +52,7 @@ jQuery.event = {
 
 		// Handle multiple events separated by a space
 		// jQuery(...).bind("mouseover mouseout", fn);
-		types = jQuery.trim( hoverHack(types) ).split( " " );
+		types = jQuery.trim( types ).split( " " );
 		for ( t = 0; t < types.length; t++ ) {
 
 			tns = rtypenamespace.exec( types[t] ) || [];
@@ -139,7 +135,7 @@ jQuery.event = {
 		}
 
 		// Once for each type.namespace in types; type may be omitted
-		types = jQuery.trim( hoverHack( types || "" ) ).split(" ");
+		types = jQuery.trim( types ).split(" ");
 		for ( t = 0; t < types.length; t++ ) {
 			tns = rtypenamespace.exec( types[t] ) || [];
 			type = origType = tns[1];

test/unit/deprecated.js

@@ -107,4 +107,33 @@ if ( jQuery.browser ) {
 		ok(!!jQuery.attrFn, "attrFnPresent");
 	});
 
+	test("hover pseudo-event", function() {
+		expect(2);
+
+		var balance = 0;
+		jQuery( "#firstp" )
+			.on( "hovercraft", function() {
+				ok( false, "hovercraft is full of ills" );
+			})
+			.on( "click.hover.me.not", function( e ) {
+				equal( e.handleObj.namespace, "hover.me.not", "hover hack doesn't mangle namespaces" );
+			})
+			.bind("hover", function( e ) {
+				if ( e.type === "mouseenter" ) {
+					balance++;
+				} else if ( e.type === "mouseleave" ) {
+					balance--;
+				} else {
+					ok( false, "hover pseudo: unknown event type "+e.type );
+				}
+			})
+			.trigger("click")
+			.trigger("mouseenter")
+			.trigger("mouseleave")
+			.unbind("hover")
+			.trigger("mouseenter");
+
+		equal( balance, 0, "hover pseudo-event" );
+	});
+
 }

test/unit/event.js

@@ -798,8 +798,8 @@ test("unbind(eventObject)", function() {
 	assert( 0 );
 });
 
-test("hover() and hover pseudo-event", function() {
-	expect(3);
+test("hover() mouseenter mouseleave", function() {
+	expect(1);
 
 	var times = 0,
 		handler1 = function( event ) { ++times; },
@@ -817,30 +817,6 @@ test("hover() and hover pseudo-event", function() {
 
 	equal( times, 4, "hover handlers fired" );
 
-	var balance = 0;
-	jQuery( "#firstp" )
-		.on( "hovercraft", function() {
-			ok( false, "hovercraft is full of ills" );
-		})
-		.on( "click.hover.me.not", function( e ) {
-			equal( e.handleObj.namespace, "hover.me.not", "hover hack doesn't mangle namespaces" );
-		})
-		.bind("hover", function( e ) {
-			if ( e.type === "mouseenter" ) {
-				balance++;
-			} else if ( e.type === "mouseleave" ) {
-				balance--;
-			} else {
-				ok( false, "hover pseudo: unknown event type "+e.type );
-			}
-		})
-		.trigger("click")
-		.trigger("mouseenter")
-		.trigger("mouseleave")
-		.unbind("hover")
-		.trigger("mouseenter");
-
-	equal( balance, 0, "hover pseudo-event" );
 });
 
 test("mouseover triggers mouseenter", function() {