Keep arrow and special keys in insert

Advanced users won't need it and is useful for beginners. Revert part of helix-editor#3671.
pickfire · Sep 20, 2022 · ccf296c · ccf296c
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diff --git a/book/src/keymap.md b/book/src/keymap.md
@@ -335,32 +335,22 @@ experience.
 | `Backspace`, `Ctrl-h`                       | Delete previous char        | `delete_char_backward`  |
 | `Delete`, `Ctrl-d`                          | Delete next char            | `delete_char_forward`   |
 
-However, if you really want navigation in insert mode, this is supported. An
-example config that gives the ability to use arrow keys while still in insert
-mode:
-
-```toml
-[keys.insert]
-"up" = "move_line_up"
-"down" = "move_line_down"
-"left" = "move_char_left"
-"right" = "move_char_right"
-"C-b" = "move_char_left"
-"C-f" = "move_char_right"
-"A-b" = "move_prev_word_end"
-"C-left" = "move_prev_word_end"
-"A-f" = "move_next_word_start"
-"C-right" = "move_next_word_start"
-"A-<" = "goto_file_start"
-"A->" = "goto_file_end"
-"pageup" = "page_up"
-"pagedown" = "page_down"
-"home" = "goto_line_start"
-"C-a" = "goto_line_start"
-"end" = "goto_line_end_newline"
-"C-e" = "goto_line_end_newline"
-"A-left" = "goto_line_start"
-```
+### Insert Mode (beginners)
+
+These keys are not recommended, it is for those who do not read documentations.
+
+| Key                                         | Description                 | Command                 |
+| -----                                       | -----------                 | -------                 |
+| `Up`                                        | Move to previous line       | `move_line_up`          |
+| `Down`                                      | Move to next line           | `move_line_down`        |
+| `Left`                                      | Backward a char             | `move_char_left`        |
+| `Right`                                     | Forward a char              | `move_char_right`       |
+| `Ctrl-Left`                                 | Backward a word             | `move_prev_word_end`    |
+| `Ctrl-Right`                                | Forward a word              | `move_next_word_start`  |
+| `PageUp`                                    | Move one page up            | `page_up`               |
+| `PageDown`                                  | Move one page down          | `page_down`             |
+| `Home`                                      | Move to line start          | `goto_line_start`       |
+| `End`                                       | Move to line end            | `goto_line_end_newline` |
 
 ## Select / extend mode
 

diff --git a/helix-term/src/keymap/default.rs b/helix-term/src/keymap/default.rs
@@ -360,6 +360,17 @@ pub fn default() -> HashMap<Mode, Keymap> {
 
         "C-x" => completion,
         "C-r" => insert_register,
+
+        "up" => move_line_up,
+        "down" => move_line_down,
+        "left" => move_char_left,
+        "right" => move_char_right,
+        "C-left" => move_prev_word_end,
+        "C-right" => move_next_word_start,
+        "pageup" => page_up,
+        "pagedown" => page_down,
+        "home" => goto_line_start,
+        "end" => goto_line_end_newline,
     });
     hashmap!(
         Mode::Normal => Keymap::new(normal),