Annotation deleted while retriveing it in JS

fpdfsdk/cpdfsdk_interform.cpp

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "fpdfsdk/cpdfsdk_interform.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 99 matching lines @@
   }
 
   if (!pPage)
     return nullptr;
 
   return static_cast<CPDFSDK_Widget*>(pPage->GetAnnotByDict(pControlDict));
 }
 
 void CPDFSDK_InterForm::GetWidgets(
     const CFX_WideString& sFieldName,
-    std::vector<CPDFSDK_Widget*>* widgets) const {
+    std::vector<CPDFSDK_Annot::ObservedPtr>* widgets) const {
   for (int i = 0, sz = m_pInterForm->CountFields(sFieldName); i < sz; ++i) {
     CPDF_FormField* pFormField = m_pInterForm->GetField(i, sFieldName);
     ASSERT(pFormField);
     GetWidgets(pFormField, widgets);
   }
 }
 
 void CPDFSDK_InterForm::GetWidgets(
     CPDF_FormField* pField,
-    std::vector<CPDFSDK_Widget*>* widgets) const {
+    std::vector<CPDFSDK_Annot::ObservedPtr>* widgets) const {
   for (int i = 0, sz = pField->CountControls(); i < sz; ++i) {
     CPDF_FormControl* pFormCtrl = pField->GetControl(i);
     ASSERT(pFormCtrl);
     CPDFSDK_Widget* pWidget = GetWidget(pFormCtrl);
     if (pWidget)
-      widgets->push_back(pWidget);
+      widgets->emplace_back(pWidget);
   }
 }
 
 int CPDFSDK_InterForm::GetPageIndexByAnnotDict(
     CPDF_Document* pDocument,
     CPDF_Dictionary* pAnnotDict) const {
   ASSERT(pAnnotDict);
 
   for (int i = 0, sz = pDocument->GetPageCount(); i < sz; i++) {
     if (CPDF_Dictionary* pPageDict = pDocument->GetPage(i)) {
@@ skipping 546 matching lines @@
   }
 }
 
 FX_COLORREF CPDFSDK_InterForm::GetHighlightColor(int nFieldType) {
   if (nFieldType < 0 || nFieldType > kNumFieldTypes)
     return FXSYS_RGB(255, 255, 255);
   if (nFieldType == 0)
     return m_aHighlightColor[0];
   return m_aHighlightColor[nFieldType - 1];
 }