Files.app: Clear the stored destination path on clear the drop target.

chrome/browser/resources/file_manager/js/file_transfer_controller.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.
 
 'use strict';
 
 /**
  * Global (placed in the window object) variable name to hold internal
  * file dragging information. Needed to show visual feedback while dragging
  * since DataTransfer object is in protected state. Reachable from other
@@ skipping 459 matching lines @@
    * @param {Element} domElement Target of the drop.
    * @param {boolean} isDirectory If the target is a directory.
    * @param {DataTransfer} dataTransfer Data transfer object.
    * @param {string} destinationPath Destination path.
    */
   setDropTarget_: function(domElement, isDirectory, dataTransfer,
                            destinationPath) {
     if (this.dropTarget_ == domElement)
       return;
 
-    /** @type {string?} */
-    this.destinationPath_ = null;
+    // Remove the old drop target.
+    this.clearDropTarget_();
 
     // Add accept class if the domElement can accept the drag.
     if (isDirectory &&
         this.canPasteOrDrop_(dataTransfer, destinationPath)) {
       domElement.classList.add('accepts');
       this.destinationPath_ = destinationPath;
     }
 
-    // Remove the old drag target.
-    this.clearDropTarget_();
-
     // Set the new drop target.
     this.dropTarget_ = domElement;
 
     // Start timer changing the directory.
     if (domElement && isDirectory && destinationPath &&
         this.canPasteOrDrop_(dataTransfer, destinationPath)) {
       this.navigateTimer_ = setTimeout(function() {
         if (domElement instanceof DirectoryItem)
           // Do custom action.
           (/** @type {DirectoryItem} */ domElement).doDropTargetAction();
 
         this.directoryModel_.changeDirectory(destinationPath);
       }.bind(this), 2000);
     }
   },
 
   /**
    * Clears the drop target.
    * @this {FileTransferController}
    */
   clearDropTarget_: function() {
     if (this.dropTarget_ && this.dropTarget_.classList.contains('accepts'))
       this.dropTarget_.classList.remove('accepts');
     this.dropTarget_ = null;
+    this.destinationPath_ = null;
     if (this.navigateTimer_ !== undefined) {
       clearTimeout(this.navigateTimer_);
       this.navigateTimer_ = undefined;
     }
   },
 
   /**
    * @this {FileTransferController}
    * @return {boolean} Returns false if {@code <input type="text">} element is
    *     currently active. Otherwise, returns true.
@@ skipping 301 matching lines @@
         !event.ctrlKey) {
       return 'move';
     }
     if (event.dataTransfer.effectAllowed == 'copyMove' &&
         event.shiftKey) {
       return 'move';
     }
     return 'copy';
   },
 };