Merge branch 'u/mantepse/dense_lls-31897' of git://trac.sagemath.org/…

…sage into t/32324/lazy_taylor_series

src/sage/rings/lazy_laurent_series.py

@@ -1125,8 +1125,8 @@ def _acted_upon_(self, scalar, self_on_left):
                                                               order=v, constant=c,
                                                               degree=self._coeff_stream._degree))
         if self_on_left or R.is_commutative():
-            return P.element_class(P, CoefficientStream_rmul(self._coeff_stream, scalar))
-        return P.element_class(P, CoefficientStream_lmul(self._coeff_stream, scalar))
+            return P.element_class(P, CoefficientStream_lmul(self._coeff_stream, scalar))
+        return P.element_class(P, CoefficientStream_rmul(self._coeff_stream, scalar))
 
     def _neg_(self):
         """