Merge 58829 - Reviewed by Adele Peterson....

WebCore/page/EventHandler.cpp

Index: WebCore/page/EventHandler.cpp
===================================================================
--- WebCore/page/EventHandler.cpp	(revision 48065)
+++ WebCore/page/EventHandler.cpp	(working copy)
@@ -2162,7 +2162,9 @@
 
     if (initialKeyEvent.type() == PlatformKeyboardEvent::RawKeyDown) {
         node->dispatchEvent(keydown, ec);
-        return keydown->defaultHandled() || keydown->defaultPrevented();
+        // If frame changed as a result of keydown dispatch, then return true to avoid sending a subsequent keypress message to the new frame.
+        bool changedFocusedFrame = m_frame->page() && m_frame != m_frame->page()->focusController()->focusedOrMainFrame();
+        return keydown->defaultHandled() || keydown->defaultPrevented() || changedFocusedFrame;
     }
 
     // Run input method in advance of DOM event handling.  This may result in the IM
@@ -2182,7 +2184,9 @@
     }
 
     node->dispatchEvent(keydown, ec);
-    bool keydownResult = keydown->defaultHandled() || keydown->defaultPrevented();
+    // If frame changed as a result of keydown dispatch, then return early to avoid sending a subsequent keypress message to the new frame.
+    bool changedFocusedFrame = m_frame->page() && m_frame != m_frame->page()->focusController()->focusedOrMainFrame();
+    bool keydownResult = keydown->defaultHandled() || keydown->defaultPrevented() || changedFocusedFrame;
     if (handledByInputMethod || (keydownResult && !backwardCompatibilityMode))
         return keydownResult;