`!` bash-command input can hang on submit due to filename-completion dropdown stealing keystrokes

When typing a shell command via the ! prefix that includes a path-like token (e.g. ls -a /root, ls \root), the input box's filename-completion/autocomplete dropdown sometimes activates and captures subsequent keystrokes (including Enter), so the command never submits to the shell — it just sits at the prompt with no output, no error, indefinitely. Pressing Escape before Enter dismisses the dropdown and lets the command run normally, confirming the underlying shell/command execution isn't at fault.

Repro steps:

1. Type ! to enter bash-command mode.
2. Type a command referencing an absolute or backslash-prefixed path, e.g. ls -a /root.
3. Press Enter without first pressing Escape.
4. Observe: no output, command does not appear to execute.
5. Press Escape, retype/submit — command runs normally.

Expected: Enter should submit the command to the shell regardless of any open autocomplete suggestion, or the dropdown shouldn't intercept Enter unless an item is actively highlighted for selection.