Make A-hjkl tree-sitter nav A-pion (#2205)

A-hl currently is not very consistent with hl when next object is
selected, since it may go up/down or left/right and this behavior is
confusing such that some people think it should swap the keys with A-jk,
so it is better to use A-pn since that only specifies two direction.

A-jk have the same issue as in it usually moves right and is not
consistent with the behavior of jk so people may think A-hl is better,
maybe A-oi is better here since A-hl will be swapped to A-pn, A-oi can
convey the meaning of in and out, similar to some window manager keys?

book/src/keymap.md

@@ -111,10 +111,10 @@
 | `K`                   | Keep selections matching the regex                                | `keep_selections`                    |
 | `Alt-K`               | Remove selections matching the regex                              | `remove_selections`                  |
 | `Ctrl-c`              | Comment/uncomment the selections                                  | `toggle_comments`                    |
-| `Alt-k`, `Alt-up`     | Expand selection to parent syntax node (**TS**)                   | `expand_selection`                   |
-| `Alt-j`, `Alt-down`   | Shrink syntax tree object selection (**TS**)                      | `shrink_selection`                   |
-| `Alt-h`, `Alt-left`   | Select previous sibling node in syntax tree (**TS**)              | `select_prev_sibling`                |
-| `Alt-l`, `Alt-right`  | Select next sibling node in syntax tree (**TS**)                  | `select_next_sibling`                |
+| `Alt-o`, `Alt-up`     | Expand selection to parent syntax node (**TS**)                   | `expand_selection`                   |
+| `Alt-i`, `Alt-down`   | Shrink syntax tree object selection (**TS**)                      | `shrink_selection`                   |
+| `Alt-p`, `Alt-left`   | Select previous sibling node in syntax tree (**TS**)              | `select_prev_sibling`                |
+| `Alt-n`, `Alt-right`  | Select next sibling node in syntax tree (**TS**)                  | `select_next_sibling`                |
 
 ### Search
 

helix-term/src/keymap/default.rs

@@ -79,10 +79,10 @@ pub fn default() -> HashMap<Mode, Keymap> {
         "S" => split_selection,
         ";" => collapse_selection,
         "A-;" => flip_selections,
-        "A-k" | "A-up" => expand_selection,
-        "A-j" | "A-down" => shrink_selection,
-        "A-h" | "A-left" => select_prev_sibling,
-        "A-l" | "A-right" => select_next_sibling,
+        "A-o" | "A-up" => expand_selection,
+        "A-i" | "A-down" => shrink_selection,
+        "A-p" | "A-left" => select_prev_sibling,
+        "A-n" | "A-right" => select_next_sibling,
 
         "%" => select_all,
         "x" => extend_line,