REF: combine_first blockmanager.where frame.py

Trying to solve REF/CLN pandas-dev#38174, it passes the first standard test, but not the others.

Author: RufflesV

pandas/core/frame.py

@@ -8701,8 +8701,8 @@ def combiner(x, y):
             # just return y_values.
             if y.name not in self.columns:
                 return y_values
-
-            return expressions.where(mask, y_values, x_values)
+            values = self._mgr.where(y_values, mask, align=True)
+            return values
 
         if len(other) == 0:
             combined = self.reindex(