Typing '%' restrict autocompletion to magics

IPython/core/completer.py

@@ -2139,8 +2139,9 b' class IPCompleter(Completer):'
         # different types of objects.  The rlcomplete() method could then
         # simply collapse the dict into a list for readline, but we'd have
         # richer completion semantics in other environments.
-        completions:Iterable[Any] = []
-        if self.use_jedi:
+        is_magic_prefix = len(text) > 0 and text[0] == "%"
+        completions: Iterable[Any] = []
+        if self.use_jedi and not is_magic_prefix:
             if not full_text:
                 full_text = line_buffer
             completions = self._jedi_matches(

IPython/core/tests/test_completer.py

@@ -1262,3 +1262,14 b' class TestCompleter(unittest.TestCase):'
         _, matches = ip.complete(None, "test.meth(")
         self.assertIn("meth_arg1=", matches)
         self.assertNotIn("meth2_arg1=", matches)
+
+    def test_percent_symbol_restrict_to_magic_completions(self):
+        ip = get_ipython()
+        completer = ip.Completer
+        text = "%a"
+
+        with provisionalcompleter():
+            completer.use_jedi = True
+            completions = completer.completions(text, len(text))
+            for c in completions:
+                self.assertEqual(c.text[0], "%")