Add special style for withAttribute in tests

dev/nix-ide-semantic-highlighting.patch

@@ -0,0 +1,21 @@
+diff --git a/package.json b/package.json
+--- a/package.json
++++ b/package.json
+@@ -100,7 +100,15 @@
+         "editor.insertSpaces": true,
+         "editor.tabSize": 2
+       }
+-    }
++    },
++    "semanticTokenScopes": [
++      {
++        "language": "nix",
++        "scopes": {
++          "*.withAttribute": ["markup.underline"]
++        }
++      }
++    ]
+   },
+   "devDependencies": {
+     "@commitlint/cli": "*",
+

dev/vim-coc.nix

@@ -73,6 +73,7 @@ let
 
     highlight link CocSemEscape     TSStringEscape
     highlight link CocSemUnresolved Error
+    highlight link CocSemWithAttribute Underlined
 
     highlight link CocSemDelimiterPunctuation   TSPunctDelimiter
     highlight link CocSemConditionalKeyword     Conditional

dev/vscodium.nix

@@ -3,7 +3,13 @@ with pkgs;
 let
   codium = vscode-with-extensions.override {
     vscode = vscodium;
-    vscodeExtensions = [ vscode-extensions.jnoortheen.nix-ide ];
+    vscodeExtensions = [
+      (vscode-extensions.jnoortheen.nix-ide.overrideAttrs (old: {
+        patches = old.patches or [] ++ [
+          ./nix-ide-semantic-highlighting.patch
+        ];
+      }))
+    ];
   };
 in writeShellScriptBin "codium-test" ''
   set -e