Avoid handling change event when focusing tree item is sufficient.

BUG=402319
TEST=manually and run browser_tests gtest_filter=*FileManager*

Review URL: https://codereview.chromium.org/458103002

Cr-Commit-Position: refs/heads/master@{#288985}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288985 0039d316-1c4b-4281-b951-d872f2087c98

ui/file_manager/file_manager/foreground/js/directory_tree.js

@@ -550,7 +550,8 @@ VolumeItem.prototype.selectByEntry = function(entry) {
     this.searchAndSelectByEntry(entry);
     return;
   }
-  if (util.isSameEntry(entry, this.entry))
+  if (util.isSameEntry(this.entry, entry) ||
+      util.isDescendantEntry(this.entry, entry))
     this.selected = true;
 };
 
@@ -938,12 +939,18 @@ DirectoryTree.prototype.searchAndSelectByEntry = function(entry) {
       continue;
 
     if (util.isSameEntry(item.entry, entry)) {
+      this.dontHandleChangeEvent_ = true;
       item.selectByEntry(entry);
+      this.dontHandleChangeEvent_ = false;
       return true;
     }
   }
   // Otherwise, search whole tree.
-  return DirectoryItemTreeBaseMethods.searchAndSelectByEntry.call(this, entry);
+  this.dontHandleChangeEvent_ = true;
+  var found = DirectoryItemTreeBaseMethods.searchAndSelectByEntry.call(
+      this, entry);
+  this.dontHandleChangeEvent_ = false;
+  return found;
 };
 
 /**
@@ -972,7 +979,7 @@ DirectoryTree.prototype.decorate = function(
 
   // Add a handler for directory change.
   this.addEventListener('change', function() {
-    if (this.selectedItem)
+    if (this.selectedItem && !this.dontHandleChangeEvent_)
       this.selectedItem.activate();
   }.bind(this));