Fix Caps Lock bug

chrome/browser/chromeos/events/event_rewriter.cc

 // Copyright 2014 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 "chrome/browser/chromeos/events/event_rewriter.h"
 
 #include <stddef.h>
 
 #include <vector>
 
@@ skipping 858 matching lines @@
         // (i.e. a Caps Lock key on an external keyboard is pressed) since X
         // handles that itself.
         && incoming.key_code != ui::VKEY_CAPITAL
 #endif
         ) {
       chromeos::input_method::ImeKeyboard* ime_keyboard =
           ime_keyboard_for_testing_
               ? ime_keyboard_for_testing_
               : chromeos::input_method::InputMethodManager::Get()
                     ->GetImeKeyboard();
-      ime_keyboard->SetCapsLockEnabled(!ime_keyboard->CapsLockIsEnabled());
+      // Toggle Caps Lock if it is not repeated key event.
+      // Prevent continuous toggles when the key is hold down.
+      if (!key_event.is_repeat())
+        ime_keyboard->SetCapsLockEnabled(!ime_keyboard->CapsLockIsEnabled());
     }
   }
   return exact_event;
 }
 
 void EventRewriter::RewriteNumPadKeys(const ui::KeyEvent& key_event,
                                       MutableKeyState* state) {
   DCHECK(key_event.type() == ui::ET_KEY_PRESSED ||
          key_event.type() == ui::ET_KEY_RELEASED);
   static const struct NumPadRemapping {
@@ skipping 297 matching lines @@
   for (const auto& keyboard : keyboard_devices) {
     if (keyboard.id == device_id) {
       return KeyboardDeviceAddedInternal(
           keyboard.id, keyboard.name, keyboard.vendor_id, keyboard.product_id);
     }
   }
   return kDeviceUnknown;
 }
 
 }  // namespace chromeos