JS: in event callbacks replace the very outdated return false with preventDefault().

Props adamsilverstein.
Fixes #18590.
Built from https://develop.svn.wordpress.org/trunk@34977


git-svn-id: http://core.svn.wordpress.org/trunk@34942 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/js/dashboard.js

@@ -67,7 +67,8 @@ jQuery(document).ready( function($) {
 
 		$( '#quick-press .submit input[type="submit"], #quick-press .submit input[type="reset"]' ).prop( 'disabled' , false );
 
-		t = $('#quick-press').submit( function() {
+		t = $('#quick-press').submit( function( e ) {
+			e.preventDefault();
 			$('#dashboard_quick_press #publishing-action .spinner').show();
 			$('#quick-press .submit input[type="submit"], #quick-press .submit input[type="reset"]').prop('disabled', true);
 
@@ -87,8 +88,6 @@ jQuery(document).ready( function($) {
 					latestPost.css('background', 'none');
 				}, 1000);
 			}
-
-			return false;
 		} );
 
 		$('#publish').click( function() { act.val( 'post-quickpress-publish' ); } );