Filterable: When all items match the filter string, show them

Fixes gh-7307

Author: Gabriel Schulhof

js/widgets/filterable.js

@@ -112,7 +112,8 @@ $.widget( "mobile.filterable", {
 		// If nothing is hidden, then the decision whether to hide or show the items
 		// is based on the "filterReveal" option.
 		if ( hide.length === 0 ) {
-			filterItems[ opts.filterReveal ? "addClass" : "removeClass" ]( "ui-screen-hidden" );
+			filterItems[ ( opts.filterReveal && val.length === 0 ) ?
+				"addClass" : "removeClass" ]( "ui-screen-hidden" );
 		} else {
 			$( hide ).addClass( "ui-screen-hidden" );
 			$( show ).removeClass( "ui-screen-hidden" );