Magic methods fixes for reverse methods

jedi/inference/syntax_tree.py

@@ -661,15 +661,19 @@ def _infer_comparison_part(inference_state, context, left, operator, right):
 
     method_name = operator_to_magic_method[str_operator]
     magic_methods = left.py__getattribute__(method_name)
-    if not magic_methods:
-        reverse_method_name = reverse_operator_to_magic_method[str_operator]
-        magic_methods = left.py__getattribute__(reverse_method_name)
-
     if magic_methods:
         result = magic_methods.execute_with_values(right)
         if result:
             return result
 
+    if not magic_methods:
+        reverse_method_name = reverse_operator_to_magic_method[str_operator]
+        magic_methods = right.py__getattribute__(reverse_method_name)
+
+        result = magic_methods.execute_with_values(left)
+        if result:
+            return result
+
     result = ValueSet([left, right])
     debug.dbg('Used operator %s resulting in %s', operator, result)
     return result

test/completion/precedence.py

@@ -159,6 +159,25 @@ from datetime import datetime, timedelta
 #? datetime()
 (datetime() - timedelta())
 #? timedelta()
+(datetime() - datetime())
+#? timedelta()
 (timedelta() - datetime())
 #? timedelta()
 (timedelta() - timedelta())
+
+# -----------------
+# magic methods
+# -----------------
+
+class C:
+    def __sub__(self, other) -> int: ...
+    def __radd__(self, other) -> float: ...
+
+#? int()
+(C() - object())
+#? C() object()
+(object() - C())
+#? C() object()
+(C() + object())
+#? float()
+(object() + C())