fix #1693 searchbox is broken when creating ace in pre tag

demo/kitchen-sink/dev_util.js

@@ -40,14 +40,18 @@ function warn() {
     }
 }
 function def(o, key, get) {
-    Object.defineProperty(o, key, {
-        configurable: true, 
-        get: get,
-        set: function(val) {
-            delete o[key];
-            o[key] = val;
-        }
-    });
+    try {
+        Object.defineProperty(o, key, {
+            configurable: true, 
+            get: get,
+            set: function(val) {
+                delete o[key];
+                o[key] = val;
+            }
+        });
+    } catch(e) {
+        console.error(e);
+    }
 }
 def(window, "ace", function(){ warn(); return window.env.editor });
 def(window, "editor", function(){ warn(); return window.env.editor });

lib/ace/ext/searchbox.css

@@ -16,6 +16,7 @@
     position: absolute;
     top: 0px;
     z-index: 99;
+    white-space: normal;
 }
 .ace_search.left {
     border-left: 0 none;