fix(service): don't duplicate snippet's trivia when updating snippets

crates/biome_cli/tests/cases/handle_vue_files.rs

@@ -1363,3 +1363,40 @@ fn fails_for_ts_grammar_when_lang_is_not_ts() {
         result,
     ));
 }
+
+#[test]
+fn lint_vue_should_not_add_extra_newlines_in_embedded_snippet() {
+    let fs = MemoryFileSystem::default();
+    let mut console = BufferConsole::default();
+
+    fs.insert(
+        "biome.json".into(),
+        r#"{ "html": { "linter": {"enabled": true}, "experimentalFullSupportEnabled": true } }"#
+            .as_bytes(),
+    );
+
+    let file = Utf8Path::new("file.vue");
+    fs.insert(
+        file.into(),
+        r#"<script>
+import { computed } from "vue";
+</script>"#
+            .as_bytes(),
+    );
+
+    let (fs, result) = run_cli(
+        fs,
+        &mut console,
+        Args::from(["lint", "--write", file.as_str()].as_slice()),
+    );
+
+    assert!(result.is_ok(), "run_cli returned {result:?}");
+
+    assert_cli_snapshot(SnapshotPayload::new(
+        module_path!(),
+        "lint_vue_should_not_add_extra_newlines_in_embedded_snippet",
+        fs,
+        console,
+        result,
+    ));
+}

crates/biome_cli/tests/snapshots/main_cases_handle_vue_files/lint_vue_should_not_add_extra_newlines_in_embedded_snippet.snap

@@ -0,0 +1,28 @@
+---
+source: crates/biome_cli/tests/snap_test.rs
+expression: redactor(content)
+---
+## `biome.json`
+
+```json
+{
+  "html": {
+    "linter": { "enabled": true },
+    "experimentalFullSupportEnabled": true
+  }
+}
+```
+
+## `file.vue`
+
+```vue
+<script>
+import { computed } from "vue";
+</script>
+```
+
+# Emitted Messages
+
+```block
+Checked 1 file in <TIME>. No fixes applied.
+```

crates/biome_service/src/file_handlers/html.rs

@@ -1333,7 +1333,7 @@ pub(crate) fn update_snippets(
             let new_token = ident(&format!(
                 "{}{}{}",
                 leading_trivia,
-                snippet.new_code.as_str(),
+                snippet.new_code.trim(), // trim to avoid duplicating trivia
                 trailing_trivia
             ));
             mutation.replace_token(value_token, new_token);