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

(cherry picked from commit d46203b5)

Conflicts:
	sc/source/core/data/formulacell.cxx

Change-Id: I17283fc5e39da2d7222c302dd63522df69d0ad96
Reviewed-on: https://gerrit.libreoffice.org/20328Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sc/source/core/data/formulacell.cxx

@@ -1479,8 +1479,16 @@ void ScFormulaCell::Interpret()
     }
     else
     {
-        if ( ! InterpretFormulaGroup() )
+        // 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 (!InterpretFormulaGroup())
+                InterpretTail( SCITP_NORMAL);
+        }
     }
 
     // While leaving a recursion or iteration stack, insert its cells to the