nixos/{lightdm,sddm,xpra}: remove enabling of logToFile

nixos/doc/manual/release-notes/rl-1903.xml

@@ -212,6 +212,14 @@
      <literal>hardware.ckb-next.*</literal>.
     </para>
    </listitem>
+   <listitem>
+    <para>
+     The option <literal>services.xserver.displayManager.job.logToFile</literal> which was
+     previously set to <literal>true</literal> when using the display managers
+     <literal>lightdm</literal>, <literal>sddm</literal> or <literal>xpra</literal> has been
+     reset to the default value (<literal>false</literal>).
+    </para>
+   </listitem>
   </itemizedlist>
  </section>
 

nixos/modules/services/x11/display-managers/lightdm.nix

@@ -208,15 +208,11 @@ in
       }
     ];
 
-    services.xserver.displayManager.job = {
-      logToFile = true;
-
     # lightdm relaunches itself via just `lightdm`, so needs to be on the PATH
-      execCmd = ''
+    services.xserver.displayManager.job.execCmd = ''
       export PATH=${lightdm}/sbin:$PATH
       exec ${lightdm}/sbin/lightdm
     '';
-    };
 
     environment.etc."lightdm/lightdm.conf".source = lightdmConf;
     environment.etc."lightdm/users.conf".source = usersConf;

nixos/modules/services/x11/display-managers/sddm.nix

@@ -209,8 +209,6 @@ in
     ];
 
     services.xserver.displayManager.job = {
-      logToFile = true;
-
       environment = {
         # Load themes from system environment
         QT_PLUGIN_PATH = "/run/current-system/sw/" + pkgs.qt5.qtbase.qtPluginPrefix;

nixos/modules/services/x11/display-managers/xpra.nix

@@ -219,10 +219,7 @@ in
       VideoRam 192000
     '';
 
-    services.xserver.displayManager.job = {
-      logToFile = true;
-
-      execCmd = ''
+    services.xserver.displayManager.job.execCmd = ''
       ${optionalString (cfg.pulseaudio)
         "export PULSE_COOKIE=/var/run/pulse/.config/pulse/cookie"}
       exec ${pkgs.xpra}/bin/xpra start \
@@ -242,7 +239,6 @@ in
         --auth=${cfg.auth} \
         ${concatStringsSep " " cfg.extraOptions}
     '';
-    };
 
     services.xserver.terminateOnReset = false;