Handle KeyboardInterrupt when control-c is pressed when showing an error.

Author: jonathanslenders

src/prompt_toolkit/application/application.py

@@ -1470,7 +1470,10 @@ def _ignore(event: E) -> None:
     session: PromptSession[None] = PromptSession(
         message=wait_text, key_bindings=key_bindings
     )
-    await session.app.run_async()
+    try:
+        await session.app.run_async()
+    except KeyboardInterrupt:
+        pass  # Control-c pressed. Don't propagate this error.
 
 
 @contextmanager