message: Remove unnecessary borrows in `Editor`
diff: @@ -17,14 +17,14 @@ impl<'a> Editor<'a> {
  pub fn insert(&mut self, character: char) {
  match self.cursor.selection() {
  Some((left, right)) => {
  - self.cursor.move_left(&self.value);
  + self.cursor.move_left(self.value);
  self.value.remove_many(left, right);
  }
  _ => (),
  }
  - self.value.insert(self.cursor.end(&self.value), character);
  - self.cursor.move_right(&self.value);
  + self.value.insert(self.cursor.end(self.value), character);
  + self.cursor.move_right(self.value);
  }
  pub fn paste(&mut self, content: Value) {
  @@ -32,29 +32,28 @@ impl<'a> Editor<'a> {
  match self.cursor.selection() {
  Some((left, right)) => {
  - self.cursor.move_left(&self.value);
  + self.cursor.move_left(self.value);
  self.value.remove_many(left, right);
  }
  _ => (),
  }
  - self.value
  - .insert_many(self.cursor.end(&self.value), content);
  + self.value.insert_many(self.cursor.end(self.value), content);
  - self.cursor.move_right_by_amount(&self.value, length);
  + self.cursor.move_right_by_amount(self.value, length);
  }
  pub fn backspace(&mut self) {
  match self.cursor.selection() {
  Some((start, end)) => {
  - self.cursor.move_left(&self.value);
  + self.cursor.move_left(self.value);
  self.value.remove_many(start, end);
  }
  None => {
  - let start = self.cursor.start(&self.value);
  + let start = self.cursor.start(self.value);
  if start > 0 {
  - self.cursor.move_left(&self.value);
  + self.cursor.move_left(self.value);
  let _ = self.value.remove(start - 1);
  }
  @@ -68,7 +67,7 @@ impl<'a> Editor<'a> {
  self.backspace();
  }
  None => {
  - let end = self.cursor.end(&self.value);
  + let end = self.cursor.end(self.value);
  if end < self.value.len() {
  let _ = self.value.remove(end);
  