In the Edit Attachment frame, when in Edit Image mode, add a key event for Escape. There are conflicting `keydown` handlers that don't propagate the event to the modal properly.

Fixes #29121.

Built from https://develop.svn.wordpress.org/trunk@29481


git-svn-id: http://core.svn.wordpress.org/trunk@29259 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/media-grid.js

@@ -492,12 +492,18 @@
 			if ( $target.is( 'input' ) || $target.is( 'textarea' ) ) {
 				return event;
 			}
+
+			// Escape key, while in the Edit Image mode
+			if ( 27 === event.keyCode ) {
+				this.modal.close();
+			}
+
 			// The right arrow key
-			if ( event.keyCode === 39 ) {
+			if ( 39 === event.keyCode ) {
 				this.nextMediaItem();
 			}
 			// The left arrow key
-			if ( event.keyCode === 37 ) {
+			if ( 37 === event.keyCode ) {
 				this.previousMediaItem();
 			}
 		},