Fixes jquery-archive#3020 — Theme-dependent backgrounds should be applied only to ‘data-role=content’ within a dialog.

Author: Wilto

js/jquery.mobile.page.sections.js

@@ -15,6 +15,7 @@ $( ":jqmData(role='page'), :jqmData(role='dialog')" ).live( "pagecreate", functi
 
 	var $page = $( this ),
 		o = $page.data( "page" ).options,
+		pageRole = $page.jqmData( "role" ),
 		pageTheme = o.theme;
 
 	$( ":jqmData(role='header'), :jqmData(role='footer'), :jqmData(role='content')", this ).each(function() {
@@ -73,7 +74,7 @@ $( ":jqmData(role='page'), :jqmData(role='dialog')" ).live( "pagecreate", functi
 				});
 
 		} else if ( role === "content" ) {
-			if ( contentTheme ) {
+			if ( contentTheme && pageRole === "dialog" ) {
 			    $this.addClass( "ui-body-" + ( contentTheme ) );
 			}