Not hiding butter for copy/move operations by timeout.

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.
 
 // Setting the src of an img to an empty string can crash the browser, so we
 // use an empty 1x1 gif instead.
 
 /**
  * FileManager constructor.
  *
@@ skipping 1503 matching lines @@
           oldDropTarget.classList.remove('accepts');
       }, 0);
     }
     this.dropTarget_ = listItem;
   };
 
   FileManager.prototype.initButter_ = function() {
     var self = this;
     var progress = this.copyManager_.getProgress();
 
-    var options = {progress: progress.percentage, actions: {}};
+    var options = {progress: progress.percentage, actions: {}, timeout: 0};
     options.actions[str('CANCEL_LABEL')] = function cancelPaste() {
       self.copyManager_.requestCancel();
     };
     this.showButter(strf('PASTE_ITEMS_REMAINING', progress.pendingItems),
                     options);
   };
 
   FileManager.prototype.onCopyProgress_ = function(event) {
     var progress = this.copyManager_.getProgress();
 
     if (event.reason == 'BEGIN') {
       if (this.currentButter_)
         this.hideButter();
 
       clearTimeout(this.butterTimeout_);
       // If the copy process lasts more than 500 ms, we show a progress bar.
       this.butterTimeout_ = setTimeout(this.initButter_.bind(this), 500);
       return;
     }
     if (event.reason == 'PROGRESS') {
       // Perform this check inside Progress event handler, avoid to log error
       // message 'Unknown event reason: PROGRESS' in console.
       if (this.currentButter_) {
-        var options = {progress: progress.percentage};
+        var options = {progress: progress.percentage, timeout: 0};
         this.updateButter(strf('PASTE_ITEMS_REMAINING', progress.pendingItems),
                           options);
       }
       return;
     }
     if (event.reason == 'SUCCESS') {
       clearTimeout(this.butterTimeout_);
       if (this.currentButter_)
         this.hideButter();
 
@@ skipping 3164 matching lines @@
 
     chrome.fileBrowserPrivate.setGDataPreferences(changeInfo);
 
     if (oldValue) {
       event.target.removeAttribute('checked');
     } else {
       event.target.setAttribute('checked', 'checked');
     }
   };
 })();