Resolves: fdo#78838 past-the-end iterator

Inserting data in pColumnData invalidated miAutoPosColumn
See https://bugs.freedesktop.org/show_bug.cgi?id=78838#c6

Change-Id: Iece423cd8d14f5ae7bf382583c0369895a00f168

sc/source/ui/app/inputhdl.cxx

@@ -1418,7 +1418,10 @@ void ScInputHandler::GetColData()
         pDoc->GetDataEntries(
             aCursorPos.Col(), aCursorPos.Row(), aCursorPos.Tab(), true, aEntries, true);
         if (!aEntries.empty())
+        {
             pColumnData->insert(aEntries.begin(), aEntries.end());
+            miAutoPosColumn = pColumnData->end();
+        }
     }
 }