retab tab to space

IPython/frontend/html/notebook/static/js/codecell.js

@@ -46,7 +46,7 b' var IPython = (function (IPython) {'
         var output = $('<div></div>');
         cell.append(input).append(output);
         this.element = cell;
-		this.output_area = new IPython.OutputArea(output, true);
+        this.output_area = new IPython.OutputArea(output, true);
 
         // construct a completer only if class exist
         // otherwise no print view
@@ -192,17 +192,17 b' var IPython = (function (IPython) {'
 
 
     CodeCell.prototype.collapse = function () {
-		this.output_area.collapse();
+    this.output_area.collapse();
     };
 
 
     CodeCell.prototype.expand = function () {
-		this.output_area.expand();
+    this.output_area.expand();
     };
 
 
     CodeCell.prototype.toggle_output = function () {
-		this.output_area.toggle_output();
+    this.output_area.toggle_output();
     };