Make context menu aware of hidden selection

third_party/WebKit/Source/core/input/EventHandler.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 1808 matching lines @@
 #endif
   IntPoint location_in_root_frame;
 
   Element* focused_element =
       override_target_element ? override_target_element : doc->FocusedElement();
   FrameSelection& selection = frame_->Selection();
   Position start =
       selection.ComputeVisibleSelectionInDOMTreeDeprecated().Start();
   VisualViewport& visual_viewport = frame_->GetPage()->GetVisualViewport();
 
-  if (!override_target_element && start.AnchorNode() &&
+  if (!override_target_element && start.AnchorNode() && !selection.IsHidden() &&

[hugoh_UTC2, 2017/05/12 10:11:25]

I'm wondering if we can't replace this complete statement with just:
if (!override_target_element && selection.SelectionHasFocus()) - but, it feels
risky to do that in this bugfix CL. I will test this locally.

       (selection.ComputeVisibleSelectionInDOMTreeDeprecated()
            .RootEditableElement() ||
        selection.ComputeVisibleSelectionInDOMTreeDeprecated().IsRange())) {
     // TODO(editing-dev): Use of updateStyleAndLayoutIgnorePendingStylesheets
     // needs to be audited.  See http://crbug.com/590369 for more details.
     doc->UpdateStyleAndLayoutIgnorePendingStylesheets();
 
     IntRect first_rect = frame_->GetEditor().FirstRectForRange(
         selection.ComputeVisibleSelectionInDOMTree()
             .ToNormalizedEphemeralRange());
@@ skipping 277 matching lines @@
     MouseEventWithHitTestResults& mev,
     LocalFrame* subframe) {
   WebInputEventResult result =
       subframe->GetEventHandler().HandleMouseReleaseEvent(mev.Event());
   if (result != WebInputEventResult::kNotHandled)
     return result;
   return WebInputEventResult::kHandledSystem;
 }
 
 }  // namespace blink