Index: src/wp-admin/js/inline-edit-post.js
===================================================================
--- src/wp-admin/js/inline-edit-post.js	(revision 36259)
+++ src/wp-admin/js/inline-edit-post.js	(working copy)
@@ -284,6 +284,7 @@
 				}
 			},
 		'html');
+		// Prevent submitting the form when pressing Enter on a focused field.
 		return false;
 	},
 
Index: src/wp-admin/js/inline-edit-tax.js
===================================================================
--- src/wp-admin/js/inline-edit-tax.js	(revision 36259)
+++ src/wp-admin/js/inline-edit-tax.js	(working copy)
@@ -137,6 +137,8 @@
 				}
 			}
 		);
+		// Prevent submitting the form when pressing Enter on a focused field.
+		return false;
 	},
 
 	revert : function() {