Change A-left right to C-left right in insert (#2193)

Currently A-left move one word left and the behavior will be more
consistent for people coming GUI world if the key was changed to control
given that both browsers and editors like vscode uses C-left right by
default to move word rather than alt.

book/src/keymap.md

@@ -296,9 +296,9 @@ undo-able "save point" until you return to normal mode.
 | `Ctrl-r`                  | Insert a register content   | `insert_register`       |
 | `Ctrl-w`, `Alt-Backspace` | Delete previous word        | `delete_word_backward`  |
 | `Alt-d`                   | Delete next word            | `delete_word_forward`   |
-| `Alt-b`, `Alt-Left`       | Backward a word             | `move_prev_word_end`    |
+| `Alt-b`, `Ctrl-Left`      | Backward a word             | `move_prev_word_end`    |
 | `Ctrl-b`, `Left`          | Backward a char             | `move_char_left`        |
-| `Alt-f`, `Alt-Right`      | Forward a word              | `move_next_word_start`  |
+| `Alt-f`, `Ctrl-Right`     | Forward a word              | `move_next_word_start`  |
 | `Ctrl-f`, `Right`         | Forward a char              | `move_char_right`       |
 | `Ctrl-e`, `End`           | Move to line end            | `goto_line_end_newline` |
 | `Ctrl-a`, `Home`          | Move to line start          | `goto_line_start`       |

helix-term/src/keymap/default.rs

@@ -336,9 +336,9 @@ pub fn default() -> HashMap<Mode, Keymap> {
         "right" => move_char_right,
         "C-f" => move_char_right,
         "A-b" => move_prev_word_end,
-        "A-left" => move_prev_word_end,
+        "C-left" => move_prev_word_end,
         "A-f" => move_next_word_start,
-        "A-right" => move_next_word_start,
+        "C-right" => move_next_word_start,
         "A-<" => goto_file_start,
         "A->" => goto_file_end,
         "pageup" => page_up,