Stop notifications from being clipped on resize.

ui/message_center/views/message_center_view.cc

 // Copyright (c) 2013 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.
 
 #include "ui/message_center/views/message_center_view.h"
 
 #include <list>
 #include <map>
 
 #include "base/macros.h"
@@ skipping 348 matching lines @@
           next_focused_view->RequestFocus();
         }
       }
     }
   }
   message_list_view_->RemoveNotification(view);
   notification_views_.erase(view_iter);
   Update(true /* animate */);
 }
 
+// This is a separate function so we can override it in tests.
+bool MessageCenterView::SetRepositionTarget() {
+  // Set the item on the mouse cursor as the reposition target so that it
+  // should stick to the current position over the update.
+  if (message_list_view_->IsMouseHovered()) {
+    for (const auto& hover_id_view : notification_views_) {
+      MessageView* hover_view = hover_id_view.second;
+      if (hover_view->IsMouseHovered()) {
+        message_list_view_->SetRepositionTarget(hover_view->bounds());
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
 void MessageCenterView::OnNotificationUpdated(const std::string& id) {
   NotificationViewsMap::const_iterator view_iter = notification_views_.find(id);
   if (view_iter == notification_views_.end())
     return;
 
-  // Set the item on the mouse cursor as the reposition target so that it
-  // should stick to the current position over the update.
-  bool set = false;
-  if (message_list_view_->IsMouseHovered()) {
-    for (const auto& hover_id_view : notification_views_) {
-      MessageView* hover_view = hover_id_view.second;
-      if (hover_view->IsMouseHovered()) {
-        message_list_view_->SetRepositionTarget(hover_view->bounds());
-        set = true;
-        break;
-      }
-    }
-  }
-  if (!set)
+  // If there is no reposition target anymore, make sure to reset the reposition
+  // session.
+  if (!SetRepositionTarget())
     message_list_view_->ResetRepositionSession();
 
   // TODO(dimich): add MessageCenter::GetVisibleNotificationById(id)
   MessageView* view = view_iter->second;
   const NotificationList::Notifications& notifications =
       message_center_->GetVisibleNotifications();
   for (NotificationList::Notifications::const_iterator iter =
            notifications.begin(); iter != notifications.end(); ++iter) {
     if ((*iter)->id() == id) {
       int old_width = view->width();
@@ skipping 249 matching lines @@
     // Disable the close-all button since no notification is visible.
     button_bar_->SetCloseAllButtonEnabled(false);
   }
 }
 
 void MessageCenterView::SetNotificationViewForTest(MessageView* view) {
   message_list_view_->AddNotificationAt(view, 0);
 }
 
 }  // namespace message_center