Discard auto-suggestion on `Esc`

IPython/terminal/shortcuts/__init__.py

@@ -343,8 +343,9 b' def create_ipython_shortcuts(shell, for_all_platforms: bool = False) -> KeyBindi'
     kb.add("c-right", filter=has_suggestion & has_focus(DEFAULT_BUFFER))(
         auto_suggest.accept_token
     )
-    from functools import partial
-
+    kb.add("escape", filter=has_suggestion & has_focus(DEFAULT_BUFFER), eager=True)(
+        auto_suggest.discard
+    )
     kb.add("up", filter=has_suggestion & has_focus(DEFAULT_BUFFER))(
         auto_suggest.swap_autosuggestion_up(shell.auto_suggest)
     )

IPython/terminal/shortcuts/auto_suggest.py

@@ -167,6 +167,12 b' def accept(event: KeyPressEvent):'
         nc.forward_char(event)
 
 
+def discard(event: KeyPressEvent):
+    """Discard autosuggestion"""
+    buffer = event.current_buffer
+    buffer.suggestion = None
+
+
 def accept_word(event: KeyPressEvent):
     """Fill partial autosuggestion by word"""
     buffer = event.current_buffer

IPython/terminal/tests/test_shortcuts.py

@@ -6,6 +6,7 b' from IPython.terminal.shortcuts.auto_suggest import ('
     accept_character,
     accept_word,
     accept_and_keep_cursor,
+    discard,
     NavigableAutoSuggestFromHistory,
     swap_autosuggestion_up,
     swap_autosuggestion_down,
@@ -49,6 +50,22 b' def test_accept(text, suggestion, expected):'
 
 
 @pytest.mark.parametrize(
+    "text, suggestion",
+    [
+        ("", "def out(tag: str, n=50):"),
+        ("def ", "out(tag: str, n=50):"),
+    ],
+)
+def test_discard(text, suggestion):
+    event = make_event(text, len(text), suggestion)
+    buffer = event.current_buffer
+    buffer.insert_text = Mock()
+    discard(event)
+    assert not buffer.insert_text.called
+    assert buffer.suggestion is None
+
+
[e-mail](
     "text, cursor, suggestion, called",
     [
         ("123456", 6, "123456789", True),