Revert "Bump Rustyline to 7.0.0 (#2776)" (#2778)

This reverts commit e73278990c.

crates/nu-cli/src/cli.rs

@@ -1,25 +1,24 @@
 use crate::commands::classified::block::run_block;
 use crate::commands::classified::maybe_text_codec::{MaybeTextCodec, StringOrBinary};
 use crate::evaluation_context::EvaluationContext;
-#[cfg(feature = "rustyline-support")]
-use crate::keybinding::{convert_keyevent, KeyEvent};
 use crate::path::canonicalize;
 use crate::prelude::*;
 #[cfg(feature = "rustyline-support")]
 use crate::shell::Helper;
 use crate::EnvironmentSyncer;
 use futures_codec::FramedRead;
-use log::{debug, trace};
 use nu_errors::ShellError;
 use nu_protocol::hir::{ClassifiedCommand, Expression, InternalCommand, Literal, NamedArguments};
 use nu_protocol::{Primitive, ReturnSuccess, Scope, UntaggedValue, Value};
+
+use log::{debug, trace};
 #[cfg(feature = "rustyline-support")]
 use rustyline::{
     self,
     config::Configurer,
     config::{ColorMode, CompletionType, Config},
     error::ReadlineError,
-    At, Cmd, Editor, Movement, Word,
+    At, Cmd, Editor, KeyPress, Movement, Word,
 };
 use std::error::Error;
 use std::iter::Iterator;
@@ -679,19 +678,16 @@ fn default_rustyline_editor_configuration() -> Editor<Helper> {
 
     // add key bindings to move over a whole word with Ctrl+ArrowLeft and Ctrl+ArrowRight
     rl.bind_sequence(
-        convert_keyevent(KeyEvent::ControlLeft),
+        KeyPress::ControlLeft,
         Cmd::Move(Movement::BackwardWord(1, Word::Vi)),
     );
     rl.bind_sequence(
-        convert_keyevent(KeyEvent::ControlRight),
+        KeyPress::ControlRight,
         Cmd::Move(Movement::ForwardWord(1, At::AfterEnd, Word::Vi)),
     );
 
     // workaround for multiline-paste hang in rustyline (see https://github.com/kkawakam/rustyline/issues/202)
-    rl.bind_sequence(
-        convert_keyevent(KeyEvent::BracketedPasteStart),
-        rustyline::Cmd::Noop,
-    );
+    rl.bind_sequence(KeyPress::BracketedPasteStart, rustyline::Cmd::Noop);
 
     // Let's set the defaults up front and then override them later if the user indicates
     // defaults taken from here https://github.com/kkawakam/rustyline/blob/2fe886c9576c1ea13ca0e5808053ad491a6fe049/src/config.rs#L150-L167