vim: Fix escape key switching back to default mode instead of normal mode (#31843)

Closes #31728

This PR introduced new setting `"helix_mode"`. Enabling which will
enable the `vim_mode` along with `helix` behavior.

This solves issue where `vim`'s `default_mode` was being used to switch
between mode instead of opening in `default_mode`.

When `helix_mode` is enabled switcing to `Normal mode` will now switch
to `HelixNormal`


Release Notes:

- Fixed - escape key not switching to normal mode when default_mode is
insert
- Added - `helix_mode` setting to enable/disable helix key bindings

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/vim/src/vim.rs

@@ -44,6 +44,7 @@ use std::{mem, ops::Range, sync::Arc};
 use surrounds::SurroundsType;
 use theme::ThemeSettings;
 use ui::{IntoElement, SharedString, px};
+use vim_mode_setting::HelixModeSetting;
 use vim_mode_setting::VimModeSetting;
 use workspace::{self, Pane, Workspace};
 
@@ -359,8 +360,13 @@ impl Vim {
     pub fn new(window: &mut Window, cx: &mut Context<Editor>) -> Entity<Self> {
         let editor = cx.entity().clone();
 
+        let mut initial_mode = VimSettings::get_global(cx).default_mode;
+        if initial_mode == Mode::Normal && HelixModeSetting::get_global(cx).0 {
+            initial_mode = Mode::HelixNormal;
+        }
+
         cx.new(|cx| Vim {
-            mode: VimSettings::get_global(cx).default_mode,
+            mode: initial_mode,
             last_mode: Mode::Normal,
             temp_mode: false,
             exit_temporary_mode: false,
@@ -445,7 +451,11 @@ impl Vim {
 
         vim.update(cx, |_, cx| {
             Vim::action(editor, cx, |vim, _: &SwitchToNormalMode, window, cx| {
-                vim.switch_mode(vim.default_mode(cx), false, window, cx)
+                if HelixModeSetting::get_global(cx).0 {
+                    vim.switch_mode(Mode::HelixNormal, false, window, cx)
+                } else {
+                    vim.switch_mode(Mode::Normal, false, window, cx)
+                }
             });
 
             Vim::action(editor, cx, |vim, _: &SwitchToInsertMode, window, cx| {
@@ -748,10 +758,6 @@ impl Vim {
         cx.on_release(|_, _| drop(subscription)).detach();
     }
 
-    pub fn default_mode(&self, cx: &App) -> Mode {
-        VimSettings::get_global(cx).default_mode
-    }
-
     pub fn editor(&self) -> Option<Entity<Editor>> {
         self.editor.upgrade()
     }
@@ -766,7 +772,7 @@ impl Vim {
     }
 
     pub fn enabled(cx: &mut App) -> bool {
-        VimModeSetting::get_global(cx).0
+        VimModeSetting::get_global(cx).0 || HelixModeSetting::get_global(cx).0
     }
 
     /// Called whenever an keystroke is typed so vim can observe all actions