Fixing click on thumbnail in the bottom panel.

chrome/browser/resources/file_manager/js/file_manager.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * FileManager constructor.
  *
  * FileManager objects encapsulate the functionality of the file selector
  * dialogs, as well as the full screen file manager application (though the
  * latter is not yet implemented).
@@ skipping 2121 matching lines @@
           self.previewThumbnails_.appendChild(thumbnails[i]);
       }
     }
 
     function onThumbnailLoaded() {
       thumbnailLoaded++;
       if (thumbnailLoaded == thumbnailCount)
         showThumbnails();
     }
 
+    var thumbnailClickHandler =
+        this.dispatchDefaultTask_.bind(this, selection);
+
     for (var i = 0; i < selection.indexes.length; i++) {
       var entry = this.directoryModel_.getFileList().item(selection.indexes[i]);
       if (!entry)
         continue;
 
       selection.entries.push(entry);
       selection.urls.push(entry.toURL());
 
       if (thumbnailCount < MAX_PREVIEW_THUMBAIL_COUNT) {
         var box = this.document_.createElement('div');
         box.className = 'thumbnail';
         if (thumbnailCount == 0) {
           var zoomed = this.document_.createElement('div');
           zoomed.hidden = true;
           thumbnails.push(zoomed);
           function onFirstThumbnailLoaded(img, transform) {
             if (self.decorateThumbnailZoom_(zoomed, img, transform)) {
               zoomed.hidden = false;
               thumbnailsHaveZoom = true;
             }
             onThumbnailLoaded();
           }
           var thumbnail = this.renderThumbnailBox_(entry, true,
                                                    onFirstThumbnailLoaded);
+          zoomed.addEventListener('click', thumbnailClickHandler);
         } else {
           var thumbnail = this.renderThumbnailBox_(entry, true,
                                                    onThumbnailLoaded);
         }
         thumbnailCount++;
         box.appendChild(thumbnail);
         box.style.zIndex = MAX_PREVIEW_THUMBAIL_COUNT + 1 - i;
-        box.addEventListener('click',
-            this.dispatchDefaultTask_.bind(this, selection));
+        box.addEventListener('click', thumbnailClickHandler);
 
         thumbnails.push(box);
       }
 
       if (selection.iconType == null) {
         selection.iconType = FileType.getIcon(entry);
       } else if (selection.iconType != 'unknown') {
         var iconType = FileType.getIcon(entry);
         if (selection.iconType != iconType)
           selection.iconType = 'unknown';
@@ skipping 2470 matching lines @@
 
     function closeBanner() {
       self.cleanupGDataWelcome_();
       // Stop showing the welcome banner.
       localStorage[WELCOME_HEADER_COUNTER_KEY] = WELCOME_HEADER_COUNTER_LIMIT;
     }
 
     return maybeShowBanner;
   };
 })();