Index: src/wp-includes/js/media-views.js
===================================================================
--- src/wp-includes/js/media-views.js	(revision 29328)
+++ src/wp-includes/js/media-views.js	(working copy)
@@ -4753,7 +4753,7 @@
 			var method;
 
 			// Catch arrow events
-			if ( 37 === event.keyCode || 38 === event.keyCode || 39 === event.keyCode || 40 === event.keyCode ) {
+			if ( 'input' !== event.target.tagName.toLowerCase() && ( 37 === event.keyCode || 38 === event.keyCode || 39 === event.keyCode || 40 === event.keyCode ) ) {
 				this.arrowEvent(event);
 				return;
 			}