kitty: make extraConfig obey mkOrder

this change makes kitty.extraConfig obey the lib.mkOrder function so
that text can be inserted at the right place.

tests/modules/programs/kitty/default.nix

@@ -2,4 +2,5 @@
   kitty-example-settings = ./example-settings.nix;
   kitty-theme-to-themeFile = ./theme-to-themeFile.nix;
   kitty-null-shellIntegration = ./null-shellIntegration.nix;
+  kitty-example-mkOrder = ./example-mkOrder.nix;
 }

tests/modules/programs/kitty/example-mkOrder-expected.conf

@@ -0,0 +1,23 @@
+# Generated by Home Manager.
+# See https://sw.kovidgoyal.net/kitty/conf.html
+font_family DejaVu Sans
+font_size 8
+
+# Shell integration is sourced and configured manually
+shell_integration no-rc
+
+include ~/.cache/wal/colors-kitty.conf
+
+background_opacity 0.500000
+enable_audio_bell no
+scrollback_lines 10000
+update_check_interval 0
+
+action_alias launch_tab launch --cwd=current --type=tab
+action_alias launch_window launch --cwd=current --type=os-window
+
+map ctrl+c copy_or_interrupt
+map ctrl+f>2 set_font_size 20
+
+env LS_COLORS=1
+

tests/modules/programs/kitty/example-mkOrder.nix

@@ -0,0 +1,49 @@
+{ lib, pkgs, ... }:
+{
+  config = {
+    programs.kitty = {
+      enable = true;
+
+      darwinLaunchOptions = lib.mkIf pkgs.stdenv.hostPlatform.isDarwin [
+        "--single-instance"
+        "--directory=/tmp/my-dir"
+        "--listen-on=unix:/tmp/my-socket"
+      ];
+
+      settings = {
+        scrollback_lines = 10000;
+        enable_audio_bell = false;
+        update_check_interval = 0;
+        background_opacity = 0.5;
+      };
+
+      font.name = "DejaVu Sans";
+      font.size = 8;
+
+      keybindings = {
+        "ctrl+c" = "copy_or_interrupt";
+        "ctrl+f>2" = "set_font_size 20";
+      };
+
+      actionAliases = {
+        "launch_tab" = "launch --cwd=current --type=tab";
+        "launch_window" = "launch --cwd=current --type=os-window";
+      };
+
+      environment = {
+        LS_COLORS = "1";
+      };
+
+      extraConfig = lib.mkOrder 535 ''
+        include ~/.cache/wal/colors-kitty.conf
+      '';
+    };
+
+    nmt.script = ''
+      assertFileExists home-files/.config/kitty/kitty.conf
+      assertFileContent \
+        home-files/.config/kitty/kitty.conf \
+        ${./example-mkOrder-expected.conf}
+    '';
+  };
+}

tests/modules/programs/kitty/example-settings-expected.conf

@@ -3,7 +3,6 @@
 font_family DejaVu Sans
 font_size 8
 
-
 # Shell integration is sourced and configured manually
 shell_integration no-rc
 

tests/modules/programs/kitty/null-shellIntegration-expected.conf

@@ -4,6 +4,3 @@
 
 
 
-
-
-