Start out with our display textnode in the right state so we don't require

two-pass reflow (which printing can't handle) to display comboboxes right. Bug
311380, r+sr=roc

layout/forms/nsComboboxControlFrame.cpp

@@ -2086,8 +2086,10 @@ nsComboboxControlFrame::CreateAnonymousContent(nsPresContext* aPresContext,
   if (labelContent) {
     // set the value of the text node
     mDisplayContent.swap(labelContent);
-    mDisplayedIndex = -1;
+    mListControlFrame->GetSelectedIndex(&mDisplayedIndex);
-    mDisplayedOptionText.Truncate();
+    if (mDisplayedIndex != -1) {
+      mListControlFrame->GetOptionText(mDisplayedIndex, mDisplayedOptionText);
+    }
     ActuallyDisplayText(PR_FALSE);
 
     nsCOMPtr<nsINodeInfo> nodeInfo;