Bug 1309587 - PreventDefault() on suppressed/delayed key events that are sent back to parent. r=smaug

--HG--
extra : rebase_source : 0762ef1284c063c9716a963bf40ff5cc82b48326

dom/ipc/TabChild.cpp

@@ -1804,6 +1804,10 @@ TabChild::RecvRealKeyEvent(const WidgetKeyboardEvent& event,
     mIgnoreKeyPressEvent = status == nsEventStatus_eConsumeNoDefault;
   }
 
+  if (localEvent.mFlags.mIsSuppressedOrDelayed) {
+    localEvent.PreventDefault();
+  }
+
   // If a response is desired from the content process, resend the key event.
   // If mAccessKeyForwardedToChild is set, then don't resend the key event yet
   // as RecvHandleAccessKey will do this.

layout/base/nsPresShell.cpp

@@ -7513,6 +7513,7 @@ PresShell::HandleEvent(nsIFrame* aFrame,
         delete event;
       }
     }
+    aEvent->mFlags.mIsSuppressedOrDelayed = true;
     return NS_OK;
   }
 

widget/BasicEvents.h

@@ -132,6 +132,10 @@ public:
   // Similar to mComposed. Set it to true to allow events cross the boundary
   // between native non-anonymous content and native anonymouse content
   bool mComposedInNativeAnonymousContent : 1;
+  // True if the event is suppressed or delayed. This is used when parent side
+  // process the key event after content side, parent side may drop the key
+  // event if it was suppressed or delayed in content side.
+  bool mIsSuppressedOrDelayed : 1;
 
   // If the event is being handled in target phase, returns true.
   inline bool InTargetPhase() const