Mouse: Don't stop propagation of mouseup

Fixes #10818

tests/unit/draggable/core.js

@@ -345,4 +345,21 @@ test( "ui-draggable-handle managed correctly in nested draggables", function( as
 	assert.hasClasses( child, "ui-draggable-handle", "child retains class name on destroy" );
 } );
 
+test( "does not stop propagation to window", function( assert ) {
+	expect( 1 );
+	var element = $( "#draggable1" ).draggable();
+
+	var handler = function() {
+		assert.ok( true, "mouseup propagates to window" );
+	};
+	$( window ).on( "mouseup", handler );
+
+	element.simulate( "drag", {
+		dx: 10,
+		dy: 10
+	} );
+
+	$( window ).off( "mouseup", handler );
+} );
+
 } );

ui/widgets/draggable.js

@@ -255,7 +255,7 @@ $.widget( "ui.draggable", $.ui.mouse, {
 		if ( !noPropagation ) {
 			var ui = this._uiHash();
 			if ( this._trigger( "drag", event, ui ) === false ) {
-				this._mouseUp( {} );
+				this._mouseUp( new $.Event( "mouseup", event ) );
 				return false;
 			}
 			this.position = ui.position;
@@ -322,7 +322,7 @@ $.widget( "ui.draggable", $.ui.mouse, {
 	cancel: function() {
 
 		if ( this.helper.is( ".ui-draggable-dragging" ) ) {
-			this._mouseUp( {} );
+			this._mouseUp( new $.Event( "mouseup", { target: this.element[ 0 ] } ) );
 		} else {
 			this._clear();
 		}

ui/widgets/mouse.js

@@ -189,7 +189,7 @@ return $.widget( "ui.mouse", {
 		}
 
 		mouseHandled = false;
-		return false;
+		event.preventDefault();
 	},
 
 	_mouseDistanceMet: function( event ) {