Workaround fix for Alt-Gr case.

On Windows, "Alt" key will set both alt and meta is on (issue 2215).
But Alt-Gr is used to insert alternate character.

BUG=10846

Review URL: http://codereview.chromium.org/99216

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@14932 0039d316-1c4b-4281-b951-d872f2087c98

webkit/glue/editor_client_impl.cc

@@ -613,16 +613,20 @@ bool EditorClientImpl::handleEditingKeyboardEvent(
 
   // Here we need to filter key events.
   // On Gtk/Linux, it emits key events with ASCII text and ctrl on for ctrl-<x>.
-  // In Webkit, EditorClient::handleKeyboardEvent in 
+  // In Webkit, EditorClient::handleKeyboardEvent in
   // WebKit/gtk/WebCoreSupport/EditorClientGtk.cpp drop such events.
   // On Mac, it emits key events with ASCII text and meta on for Command-<x>.
   // These key events should not emit text insert event.
   // Alt key would be used to insert alternative character, so we should let
-  // through. Also note that Ctrl-Alt combination equals to AltGr key which is 
+  // through. Also note that Ctrl-Alt combination equals to AltGr key which is
   // also used to insert alternative character.
   // http://code.google.com/p/chromium/issues/detail?id=10846
-  // In summary, we can't think of a scenario where you'd use control w/o alt or
-  // meta to do insertion of a ASCII character.
+  // Windows sets both alt and meta are on when "Alt" key pressed.
+  // http://code.google.com/p/chromium/issues/detail?id=2215
+  // Also, we should not rely on an assumption that keyboards don't
+  // send ASCII characters when pressing a control key on Windows,
+  // which may be configured to do it so by user.
+  // See also http://en.wikipedia.org/wiki/Keyboard_Layout
   // TODO(ukai): investigate more detail for various keyboard layout.
   if (evt->keyEvent()->text().length() == 1) {
     UChar ch = evt->keyEvent()->text()[0U];
@@ -631,11 +635,18 @@ bool EditorClientImpl::handleEditingKeyboardEvent(
     // unexpected behaviour
     if (ch < ' ')
       return false;
+#if !defined(OS_WIN)
     // Don't insert ASCII character if ctrl w/o alt or meta is on.
-    if (ch < 0x80 &&
-        ((evt->keyEvent()->ctrlKey() && !evt->keyEvent()->altKey()) ||
-        evt->keyEvent()->metaKey()))
-      return false;
+    // On Mac, we should ignore events when meta is on (Command-<x>).
+    if (ch < 0x80) {
+      if (evt->keyEvent()->ctrlKey() && !evt->keyEvent()->altKey())
+        return false;
+#if defined(OS_MACOSX)
+      if (evt->keyEvent()->metaKey())
+        return false;
+#endif
+    }
+#endif
   }
 
   if (!frame->editor()->canEdit())