Resolves: tdf#95748 no group interpreter when calculations are running

Change-Id: I17283fc5e39da2d7222c302dd63522df69d0ad96
(cherry picked from commit d46203b5)

sc/source/core/data/formulacell.cxx

@@ -1551,15 +1551,24 @@ void ScFormulaCell::Interpret()
     }
     else
     {
+        // Do not attempt to interpret a group when calculations are already
+        // running, otherwise we may run into a circular reference hell. See
+        // tdf#95748
+        if (rRecursionHelper.GetRecursionCount())
+            InterpretTail( SCITP_NORMAL);
+        else
+        {
 #if DEBUG_CALCULATION
-        aDC.enterGroup();
-#endif
-        bool bGroupInterpreted = InterpretFormulaGroup();
-#if DEBUG_CALCULATION
-        aDC.leaveGroup();
+            aDC.enterGroup();
+            bool bGroupInterpreted = InterpretFormulaGroup();
+            aDC.leaveGroup();
+            if (!bGroupInterpreted)
+                InterpretTail( SCITP_NORMAL);
+#else
+            if (!InterpretFormulaGroup())
+                InterpretTail( SCITP_NORMAL);
 #endif
-        if (!bGroupInterpreted)
-            InterpretTail( SCITP_NORMAL);
+        }
     }
 
     // While leaving a recursion or iteration stack, insert its cells to the