gh-134869: Fix Ctrl+C corrupts REPL autocomplete (GH-134929)

(cherry picked from commit 8750e5e)

Co-authored-by: ggqlq <[email protected]>

Author: ggqlq

Lib/_pyrepl/simple_interact.py

@@ -156,6 +156,7 @@ def maybe_run_command(statement: str) -> bool:
             input_n += 1
         except KeyboardInterrupt:
             r = _get_reader()
+            r.cmpltn_reset()
             if r.input_trans is r.isearch_trans:
                 r.do_cmd(("isearch-end", [""]))
             r.pos = len(r.get_unicode())

Misc/NEWS.d/next/Library/2025-08-18-16-02-51.gh-issue-134869.GnAjnU.rst

@@ -0,0 +1 @@
+Fix an issue where pressing Ctrl+C during tab completion in the REPL would leave the autocompletion menu in a corrupted state.