(feature) Add Stage Manager (com.apple.WindowManager) settings as system.defaults.windowmanager

All credits go to @AlexOwl. Their [PR](https://github.com/LnL7/nix-darwin/pull/505)
looked abandonned so I reported their changes and addressed the change
requests.

1 files changed, 76 insertions, 0 deletions

diff --git a/modules/system/defaults/WindowManager.nix b/modules/system/defaults/WindowManager.nix
new file mode 100644
index 0000000..38fbaa3
--- /dev/null
+++ b/modules/system/defaults/WindowManager.nix
@@ -0,0 +1,76 @@
+{ config, lib, ... }:
+
+with lib;
+{
+  options = {
+    system.defaults.WindowManager.GloballyEnabled = mkOption {
+      type = types.nullOr types.bool;
+      default = null;
+      description = ''
+        Enable Stage Manager
+        Stage Manager arranges your recent windows into a single strip for reduced clutter and quick access. Default is false.
+      '';
+    };
+
+    system.defaults.WindowManager.EnableStandardClickToShowDesktop = mkOption {
+      type = types.nullOr types.bool;
+      default = null;
+      description = ''
+        Click wallpaper to reveal desktop
+        Clicking your wallpaper will move all windows out of the way to allow access to your desktop items and widgets. Default is true.
+        false means "Only in Stage Manager"
+        true means "Always"
+      '';
+    };
+
+    system.defaults.WindowManager.AutoHide = mkOption {
+      type = types.nullOr types.bool;
+      default = null;
+      description = ''
+        Auto hide stage strip showing recent apps. Default is false.
+      '';
+    };
+
+    system.defaults.WindowManager.AppWindowGroupingBehavior = mkOption {
+      type = types.nullOr types.bool;
+      default = null;
+      description = ''
+        Grouping strategy when showing windows from an application.
+        false means "One at a time"
+        true means "All at once"
+      '';
+    };
+
+    system.defaults.WindowManager.StandardHideDesktopIcons = mkOption {
+      type = types.nullOr types.bool;
+      default = null;
+      description = ''
+        Hide items on desktop.
+        '';
+    };
+
+    system.defaults.WindowManager.HideDesktop = mkOption {
+      type = types.nullOr types.bool;
+      default = null;
+      description = ''
+        Hide items in Stage Manager.
+      '';
+    };
+
+    system.defaults.WindowManager.StandardHideWidgets = mkOption {
+      type = types.nullOr types.bool;
+      default = null;
+      description = ''
+          Hide widgets on desktop.
+        '';
+    };
+
+    system.defaults.WindowManager.StageManagerHideWidgets = mkOption {
+      type = types.nullOr types.bool;
+      default = null;
+      description = ''
+        Hide widgets in Stage Manager.
+      '';
+    };
+  };
+}