Bug 1401225 - Pass the correct length when collapsing the selection in EditorBase::SetTextImpl(); r=masayuki

editor/libeditor/EditorBase.cpp

@@ -2746,7 +2746,7 @@ EditorBase::SetTextImpl(Selection& aSelection, const nsAString& aString,
   // Only set selection to insertion point if editor gives permission
   if (GetShouldTxnSetSelection()) {
     RefPtr<Selection> selection = GetSelection();
-    DebugOnly<nsresult> rv = selection->Collapse(&aCharData, length);
+    DebugOnly<nsresult> rv = selection->Collapse(&aCharData, aString.Length());
     NS_ASSERTION(NS_SUCCEEDED(rv),
                  "Selection could not be collapsed after insert");
   }