File Manager: Assorted fixes and polish

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

Index: chrome/browser/resources/file_manager/js/file_manager.js
diff --git a/chrome/browser/resources/file_manager/js/file_manager.js b/chrome/browser/resources/file_manager/js/file_manager.js
index db46de394109b0d5c0a0209c45df30a44b332d2c..4b16e3ef4774550d6c77f9c768a61089e03c1d36 100644
--- a/chrome/browser/resources/file_manager/js/file_manager.js
+++ b/chrome/browser/resources/file_manager/js/file_manager.js
@@ -1618,6 +1618,8 @@ FileManager.prototype = {
    * @param {Array.<Task>} tasksList The tasks list.
    */
   FileManager.prototype.onTasksFound_ = function(selection, tasksList) {
+    this.taskButtons_.innerHTML = '';
+
     for (var i = 0; i < tasksList.length; i++) {
       var task = tasksList[i];
 
@@ -1653,9 +1655,10 @@ FileManager.prototype = {
       }
       this.renderTaskButton_(task);
     }
-    this.maybeRenderUnmountTask_(selection);
-    // This needs to be done in separate function, as check requires
+
+    // These are done in separate functions, as the checks require
     // asynchronous function calls.
+    this.maybeRenderUnmountTask_(selection);
     this.maybeRenderFormattingTask_(selection);
   };
 
@@ -2439,13 +2442,10 @@ FileManager.prototype = {
       }
     }
 
-    if (this.selection.fileCount > 1) {
+    if (this.selection.totalCount > 0) {
       // If more than one file is selected, make sure all checkboxes are lit
       // up.
       for (var i = 0; i < this.selection.entries.length; i++) {
-        if (!this.selection.entries[i].isFile)
-          continue;
-
         var selectedIndex = this.selection.indexes[i];
         var listItem = this.currentList_.getListItemByIndex(selectedIndex);
         if (listItem)