nixos/fcitx5: remove systemd service via XDG autostart files

nixos/doc/manual/from_md/release-notes/rl-2205.section.xml

@@ -1807,6 +1807,20 @@
           like the <literal>dex</literal> package.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          When setting
+          <link linkend="opt-i18n.inputMethod.enabled">i18n.inputMethod.enabled</link>
+          to <literal>fcitx5</literal>, it no longer creates
+          coresponding systemd user services. It now relies on XDG
+          autostart files to start and work properly in your desktop
+          seesions. If your are using only a window manager without a
+          desktop manager, you need to enable
+          <literal>services.xserver.desktopManager.runXdgAutostartIfNone</literal>
+          or using the <literal>dex</literal> package to make
+          <literal>fcitx5</literal> work.
+        </para>
+      </listitem>
       <listitem>
         <para>
           A new module was added for the Envoy reverse proxy, providing

nixos/doc/manual/release-notes/rl-2205.section.md

@@ -661,6 +661,12 @@ In addition to numerous new and upgraded packages, this release has the followin
   was added in order to automatically run XDG autostart files for sessions without a desktop manager.
   This replaces helpers like the `dex` package.
 
+- When setting [i18n.inputMethod.enabled](#opt-i18n.inputMethod.enabled) to `fcitx5`,
+  it no longer creates coresponding systemd user services.
+  It now relies on XDG autostart files to start and work properly in your desktop seesions.
+  If your are using only a window manager without a desktop manager, you need to enable
+  `services.xserver.desktopManager.runXdgAutostartIfNone` or using the `dex` package to make `fcitx5` work.
+
 - A new module was added for the Envoy reverse proxy, providing the options `services.envoy.enable` and `services.envoy.settings`.
 
 - The option `services.duplicati.dataDir` has been added to allow changing the location of duplicati's files.

nixos/modules/i18n/input-method/fcitx5.nix

@@ -28,11 +28,5 @@ in {
       QT_IM_MODULE = "fcitx";
       XMODIFIERS = "@im=fcitx";
     };
-
-    systemd.user.services.fcitx5-daemon = {
-      enable = true;
-      script = "${fcitx5Package}/bin/fcitx5";
-      wantedBy = [ "graphical-session.target" ];
-    };
   };
 }