gnome: make amount of max workspace thumbnails configurable and set to 11

nix-os/desktopManagers/gnome.nix

@@ -1,6 +1,21 @@
-{pkgs, ... }:
+{config, lib, pkgs, ... }:
 
+let
+  maxThumbnails = config.programs.gnome.extensions.workspaceIndicator.maxThumbnails;
+  workspaceIndicator = pkgs.gnomeExtensions.workspace-indicator.overrideAttrs {
+    postPatch = ''
+      sed -i 's/const MAX_THUMBNAILS = 6;/const MAX_THUMBNAILS = ${maxThumbnails};/' extension.js
+    '';
+  };
+in
 {
+  options = {
+    programs.gnome.extensions.workspaceIndicator.maxThumbnails = lib.mkOption {
+      type = lib.types.int;
+      default = 11;
+      description = "The maximum number of thumbnails to show in the workspace indicator";
+    };
+  };
   imports = [
     ../unstable-packages.nix
     ../dconf-common.nix
@@ -56,6 +71,7 @@
     ];
 
     environment.systemPackages = with pkgs; [
+      workspaceIndicator
       gnomeExtensions.pop-shell
       gnomeExtensions.vitals
       gnomeExtensions.tray-icons-reloaded