Make arrow keys and page up/down work in insert mode

helix-term/src/keymap.rs

@@ -321,6 +321,12 @@ impl Default for Keymaps {
                 key!(Delete) => Command::delete_char_forward,
                 key!(Enter) => Command::insert_newline,
                 key!(Tab) => Command::insert_tab,
+                key!(Left) => Command::move_char_left,
+                key!(Down) => Command::move_line_down,
+                key!(Up) => Command::move_line_up,
+                key!(Right) => Command::move_char_right,
+                key!(PageUp) => Command::page_up,
+                key!(PageDown) => Command::page_down,
                 ctrl!('x') => Command::completion,
                 ctrl!('w') => Command::delete_word_backward,
             )),