Fix dmypy suggest interaction with __new__

mypy/suggestions.py

@@ -474,7 +474,7 @@ def get_suggestion(self, mod: str, node: FuncDef) -> PyAnnotateSignature:
         if self.no_errors and orig_errors:
             raise SuggestionFailure("Function does not typecheck.")
 
-        is_method = bool(node.info) and not node.is_static
+        is_method = bool(node.info) and (not node.is_static or node.name == "__new__")
 
         with state.strict_optional_set(graph[mod].options.strict_optional):
             guesses = self.get_guesses(

test-data/unit/fine-grained-suggest.test

@@ -714,6 +714,26 @@ def bar(iany) -> None:
 (int) -> None
 ==
 
+[case testSuggestNewInit]
+# suggest: foo.F.__init__
+# suggest: foo.F.__new__
+[file foo.py]
+class F:
+    def __new__(cls, t):
+        return super().__new__(cls)
+
+    def __init__(self, t):
+        self.t = t
+
+[file bar.py]
+from foo import F
+def bar(iany) -> None:
+    F(0)
+[out]
+(int) -> None
+(int) -> Any
+==
+
 [case testSuggestColonBasic]
 # suggest: tmp/foo.py:1
 # suggest: tmp/bar/baz.py:2