Fix a crasher in CXFA_FFDocView::SetFocus()

When some layout items are released, applications should
be notified. It usually happens when there are layout
changes.

BUG=pdfium:303
R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1502133002 .

1 files changed, 9 insertions, 3 deletions

diff --git a/xfa/src/fxfa/src/parser/xfa_layout_appadapter.cpp b/xfa/src/fxfa/src/parser/xfa_layout_appadapter.cpp
index ae843cfdb4..e98795b5c9 100644
--- a/xfa/src/fxfa/src/parser/xfa_layout_appadapter.cpp
+++ b/xfa/src/fxfa/src/parser/xfa_layout_appadapter.cpp
@@ -41,12 +41,18 @@ FX_DWORD XFA_GetRelevant(CXFA_Node* pFormItem, FX_DWORD dwParentRelvant) {
   return dwRelevant;

 }

 void XFA_ReleaseLayoutItem(CXFA_LayoutItem* pLayoutItem) {

-  CXFA_LayoutItem* pNext, * pNode = pLayoutItem->m_pFirstChild;

+  CXFA_LayoutItem* pNode = pLayoutItem->m_pFirstChild;

   while (pNode) {

-    pNext = pNode->m_pNextSibling;

-    pNode->m_pParent = NULL;

+    CXFA_LayoutItem* pNext = pNode->m_pNextSibling;

+    pNode->m_pParent = nullptr;

     XFA_ReleaseLayoutItem(pNode);

     pNode = pNext;

   }

+  IXFA_Notify* pNotify =

+      pLayoutItem->m_pFormNode->GetDocument()->GetParser()->GetNotify();

+  if (pLayoutItem->m_pFormNode->GetClassID() == XFA_ELEMENT_PageArea) {

+    pNotify->OnPageEvent(static_cast<CXFA_ContainerLayoutItem*>(pLayoutItem),

+                         XFA_PAGEEVENT_PageRemoved);

+  }

   delete pLayoutItem;

 }