Fix history on workspaces, where you couldn't click on old tries.

experimental/webtry/res/js/webtry.js

 /**
  * Common JS that talks XHR back to the server and runs the code and receives
  * the results.
  */
 
 /**
  * A polyfill for HTML Templates.
  *
  * This just adds in the content attribute, it doesn't stop scripts
  * from running nor does it stop other side-effects.
@@ skipping 168 matching lines @@
       lineNumbers: true,
       matchBrackets: true,
       mode: "text/x-c++src",
       indentUnit: 4,
     });
 
     // Match the initial textarea size.
     editor.setSize(editor.defaultCharWidth() * code.cols,
                    editor.defaultTextHeight() * code.rows);
 
-    // Suppress changes to the first/last line (draw wrapper method)
-    editor.on('beforeChange', function(cm, change) {
-      if (change.from.line < 1 || change.from.line == cm.lineCount() - 1)
-        change.cancel();
-    });
-
     function beginWait() {
       document.body.classList.add('waiting');
       run.disabled = true;
     }
 
 
     function endWait() {
       document.body.classList.remove('waiting');
       run.disabled = false;
     }
@@ skipping 36 matching lines @@
      */
     function historyComplete(e) {
       // The response is JSON of the form:
       // {
       //   "hash": "unique id for a try",
       //   "code": "source code for try"
       // }
       endWait();
       body = JSON.parse(e.target.response);
       code.value = body.code;
+      editor.setValue(body.code);
       img.src = '/i/'+body.hash+'.png';
       if (permalink) {
         permalink.href = '/c/' + body.hash;
       }
     }
 
 
     /**
      * Add the given try image to the history of a workspace.
      */
@@ skipping 75 matching lines @@
 
 
     // Add the images to the history if we are on a workspace page.
     if (tryHistory && history) {
       for (var i=0; i<history.length; i++) {
         addToHistory(history[i].hash, '/i/'+history[i].hash+'.png');
       }
     }
 
 })(workspaceName);