diff -r 2f6f6f7551ca -r 32102edaa81b web/wp-includes/js/wp-list-revisions.dev.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/wp-includes/js/wp-list-revisions.dev.js	Mon Nov 19 18:26:13 2012 +0100
@@ -0,0 +1,24 @@
+(function(w) {
+	var init = function() {
+		var pr = document.getElementById('post-revisions'),
+		inputs = pr ? pr.getElementsByTagName('input') : [];
+		pr.onclick = function() {
+			var i, checkCount = 0, side;
+			for ( i = 0; i < inputs.length; i++ ) {
+				checkCount += inputs[i].checked ? 1 : 0;
+				side = inputs[i].getAttribute('name');
+				if ( ! inputs[i].checked &&
+				( 'left' == side && 1 > checkCount || 'right' == side && 1 < checkCount && ( ! inputs[i-1] || ! inputs[i-1].checked ) ) &&
+				! ( inputs[i+1] && inputs[i+1].checked && 'right' == inputs[i+1].getAttribute('name') ) )
+					inputs[i].style.visibility = 'hidden';
+				else if ( 'left' == side || 'right' == side )
+					inputs[i].style.visibility = 'visible';
+			}
+		}
+		pr.onclick();
+	}
+	if ( w && w.addEventListener )
+		w.addEventListener('load', init, false);
+	else if ( w && w.attachEvent )
+		w.attachEvent('onload', init);
+})(window);