modules/lsp/servers/vls: do not add filetype extension if not enabled

plugins/lsp/language-servers/default.nix

@@ -591,7 +591,9 @@ let
           example = false;
         };
       };
-      extraConfig = cfg: { filetype.extension = mkIf cfg.autoSetFiletype { v = "vlang"; }; };
+      extraConfig = cfg: {
+        filetype.extension = mkIf (cfg.enable && cfg.autoSetFiletype) { v = "vlang"; };
+      };
     }
     {
       name = "vuels";

tests/test-sources/plugins/lsp/language-servers/vls.nix

@@ -0,0 +1,29 @@
+{
+  default = {
+    plugins.lsp = {
+      enable = true;
+      servers.vls.enable = true;
+    };
+
+    extraConfigLuaPost = ''
+      -- V files are recognized by default
+      assert(vim.filetype.match({ filename = "test.v" }) == "vlang", "V filetype is not recognized")
+    '';
+  };
+
+  extra-options = {
+    plugins.lsp = {
+      enable = true;
+
+      servers.vls = {
+        enable = true;
+        autoSetFiletype = true;
+      };
+    };
+
+    extraConfigLuaPost = ''
+      -- autoSetFiletype
+      assert(vim.filetype.match({ filename = "test.v" }) == "vlang", "V filetype is not recognized")
+    '';
+  };
+}