gnome: Replace displays=2 settings screen with the displays>2 one

flake.nix

@@ -8,6 +8,7 @@
         baseline = ./modules/baseline.nix;
         cli = ./modules/cli.nix;
         gnome = ./modules/gnome.nix;
+        gnome-monitor-settings-tweak = ./modules/gnome-monitor-settings-tweak;
         mouse-dpi = ./modules/mouse-dpi.nix;
         phpipam = ./modules/phpipam.nix;
         pipewire = ./modules/pipewire.nix;

modules/gnome-monitor-settings-tweak/control-center.patch

@@ -0,0 +1,13 @@
+diff --git a/panels/display/cc-display-panel.c b/panels/display/cc-display-panel.c
+index f9d4ae044..ef2a8a693 100644
+--- a/panels/display/cc-display-panel.c
++++ b/panels/display/cc-display-panel.c
+@@ -853,7 +853,7 @@ rebuild_ui (CcDisplayPanel *panel)
+   n_outputs = g_list_length (outputs);
+   type = config_get_current_type (panel);
+ 
+-  if (n_outputs == 2 && n_usable_outputs == 2)
++  if (n_outputs == 2 && n_usable_outputs == 99)
+     {
+       /* We only show the top chooser with two monitors that are
+        * both usable (i.e. two monitors incl. internal and lid not closed).

modules/gnome-monitor-settings-tweak/default.nix

@@ -0,0 +1,25 @@
+{ config, pkgs, lib, ... }:
+let
+  cfg = config.sconfig.gnome-monitor-settings-tweak;
+in
+{
+  options.sconfig.gnome-monitor-settings-tweak = lib.mkOption {
+    default = true;
+    type = lib.types.bool;
+    description = "Replace displays=2 settings screen with the displays>2 one";
+  };
+
+  config = lib.mkIf cfg {
+    nixpkgs.overlays = [
+
+      (self: super: {
+        gnome = super.gnome // {
+          gnome-control-center = super.gnome.gnome-control-center.overrideAttrs (attr: {
+            patches = attr.patches ++ [ ./control-center.patch ];
+          });
+        };
+      })
+
+    ];
+  };
+}