sw_redlinehide_3: call UpdateAllFootnote() in UnHideRedlines()

... if the numbering is per-chapter, because only with a hidden layout
can the footnotes be numbered properly per-hidden-chapter.

Change-Id: I32732b7b8eec0adcbf4349aac3c87492802e38b6

sw/source/core/layout/wsfrm.cxx

@@ -4487,8 +4487,13 @@ void SwRootFrame::SetHideRedlines(bool const bHideRedlines)
         }
     }
 
+    SwFootnoteIdxs & rFootnotes(rDoc.GetFootnoteIdxs());
+    if (rDoc.GetFootnoteInfo().eNum == FTNNUM_CHAPTER)
+    {
+        // sadly determining which node is outline node requires hidden layout
+        rFootnotes.UpdateAllFootnote();
+    }
     // invalidate all footnotes to reformat their numbers
-    SwFootnoteIdxs const& rFootnotes(rDoc.GetFootnoteIdxs());
     for (SwTextFootnote *const pFootnote : rFootnotes)
     {
         SwFormatFootnote const& rFootnote(pFootnote->GetFootnote());