Suppress file completions in context of attributes/methods (ipython#15036)

### Fixes ipython#15031

### Description
Suppress `file_matcher` when matching `attribute` \\ `methods`.

Author: krassowski

IPython/core/completer.py

@@ -2481,7 +2481,7 @@ def _jedi_matcher(self, context: CompletionContext) -> _JediMatcherResult:
         return {
             "completions": matches,
             # static analysis should not suppress other matchers
-            "suppress": False,
+            "suppress": {_get_matcher_id(self.file_matcher)} if matches else False,
         }
 
     def _jedi_matches(
@@ -2741,9 +2741,12 @@ def python_matcher(self, context: CompletionContext) -> SimpleMatcherResult:
                             is None
                         )
                     matches = filter(no__name, matches)
-                return _convert_matcher_v1_result_to_v2(
+                matches = _convert_matcher_v1_result_to_v2(
                     matches, type="attribute", fragment=fragment
                 )
+                if matches["completions"]:
+                    matches["suppress"] = {_get_matcher_id(self.file_matcher)}
+                return matches
             except NameError:
                 # catches <undefined attributes>.<tab>
                 return SimpleMatcherResult(completions=[], suppress=False)

tests/test_completer.py

@@ -2332,6 +2332,40 @@ def test_undefined_variables(use_jedi, evaluation, code, insert_text):
             assert len(match) == 1, message_on_fail
 
 
+@pytest.mark.parametrize(
+    "code",
+    [
+        "\n".join(
+            [
+                "def my_test() -> float:",
+                "    return 1.1",
+                "my_test().",
+            ]
+        ),
+        "\n".join(
+            [
+                "class MyClass():",
+                "    b: list[str]",
+                "x = MyClass()",
+                "x.b[0].",
+            ]
+        ),
+    ],
+)
+def test_no_file_completions_in_attr_access(code):
+    """Test that files are not suggested during attribute/method completion."""
+    with TemporaryWorkingDirectory():
+        open(".hidden", "w", encoding="utf-8").close()
+        offset = len(code)
+        for use_jedi in (True, False):
+            with provisionalcompleter(), jedi_status(use_jedi):
+                completions = list(ip.Completer.completions(text=code, offset=offset))
+                matches = [c for c in completions if c.text.lstrip(".") == "hidden"]
+                assert (
+                    len(matches) == 0
+                ), f"File '.hidden' should not appear in attribute completion"
+
+
 @pytest.mark.parametrize(
     "line,expected",
     [