applying same fix as rev 1.28 (initializing mIsDone) to the rest of the Init() methods.

content/base/src/nsContentIterator.cpp

@@ -257,6 +257,8 @@ nsresult nsContentIterator::Init(nsIDOMRange* aRange)
   PRInt32 startIndx;
   PRInt32 endIndx;
   
+  mIsDone = PR_FALSE;
+
   // get common content parent
   if (NS_FAILED(aRange->GetCommonParent(getter_AddRefs(dN))) || !dN)
     return NS_ERROR_FAILURE;
@@ -804,6 +806,8 @@ nsresult nsContentSubtreeIterator::Init(nsIDOMRange* aRange)
   if (!aRange) 
     return NS_ERROR_NULL_POINTER; 
 
+  mIsDone = PR_FALSE;
+
   mRange = do_QueryInterface(aRange);
   
   // get the start node and offset, convert to nsIContent

layout/base/src/nsContentIterator.cpp

@@ -257,6 +257,8 @@ nsresult nsContentIterator::Init(nsIDOMRange* aRange)
   PRInt32 startIndx;
   PRInt32 endIndx;
   
+  mIsDone = PR_FALSE;
+
   // get common content parent
   if (NS_FAILED(aRange->GetCommonParent(getter_AddRefs(dN))) || !dN)
     return NS_ERROR_FAILURE;
@@ -804,6 +806,8 @@ nsresult nsContentSubtreeIterator::Init(nsIDOMRange* aRange)
   if (!aRange) 
     return NS_ERROR_NULL_POINTER; 
 
+  mIsDone = PR_FALSE;
+
   mRange = do_QueryInterface(aRange);
   
   // get the start node and offset, convert to nsIContent