Fix for bug 59774. Save scrollbar positions in sessionhistory when jumping from one anchor to another in a page. r=adamlock sr=alecf a=asa. Approved by ADT.

docshell/shistory/public/nsISHEntry.idl

@@ -95,6 +95,10 @@ attribute boolean saveLayoutStateFlag;
 /** attribute to indicate whether the page is already expired in cache */
 attribute boolean expirationStatus;
 
+/** Set/Get scrollers' positon in anchored pages */
+void setScrollPosition(in PRInt32 x, in PRInt32 y);
+void getScrollPosition(out PRInt32 x, out PRInt32 y);
+
 /** Additional ways to create an entry */
 void create(in nsIURI aURI, in wstring aTitle, in nsIDOMDocument aDocument,
 			         in nsIInputStream aInputStream, in nsILayoutHistoryState aHistoryLayoutState,

docshell/shistory/src/nsSHEntry.cpp

@@ -69,6 +69,21 @@ NS_INTERFACE_MAP_END
 //*****************************************************************************
 //    nsSHEntry: nsISHEntry
 //*****************************************************************************
+NS_IMETHODIMP nsSHEntry::SetScrollPosition(PRInt32 x, PRInt32 y)
+{
+  mScrollPositionX = x;
+  mScrollPositionY = y;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsSHEntry::GetScrollPosition(PRInt32 *x, PRInt32 *y)
+{
+  if (x && y) {
+    *x = mScrollPositionX;
+    *y = mScrollPositionY;
+  }
+  return NS_OK;
+}
 
 NS_IMETHODIMP nsSHEntry::GetURI(nsIURI** aURI)
 {

docshell/shistory/src/nsSHEntry.h

@@ -57,13 +57,15 @@ private:
 	 
   nsCOMPtr<nsIURI>                mURI;
   nsCOMPtr<nsIURI>                mReferrerURI;
-	nsCOMPtr<nsIDOMDocument>        mDocument;
-	nsString                        mTitle;
-	nsCOMPtr<nsIInputStream>        mPostData;
-	nsCOMPtr<nsILayoutHistoryState> mLayoutHistoryState;
-	nsVoidArray                     mChildren;
-	PRUint32                        mLoadType;  
-	PRUint32                        mID;
+  nsCOMPtr<nsIDOMDocument>        mDocument;
+  nsString                        mTitle;
+  nsCOMPtr<nsIInputStream>        mPostData;
+  nsCOMPtr<nsILayoutHistoryState> mLayoutHistoryState;
+  nsVoidArray                     mChildren;
+  PRUint32                        mLoadType;  
+  PRUint32                        mID;
+  PRInt32                         mScrollPositionX;
+  PRInt32                         mScrollPositionY;
   PRPackedBool                    mIsFrameNavigation;
   PRPackedBool                    mSaveLayoutState;
   PRPackedBool                    mExpired;