fix(live): discard restores the original without a blank line above and below it

`extract_original` split the wrapper's inner text on newlines and kept the
first and last pieces, which are the line breaks around the original
element inside `<div data-impeccable-variant="original">`. Every discard
therefore left one empty line before and one after the restored element.
`extract_variant` already trims those; the original now gets the same
trim. Test writes a JSX wrapper to disk, discards, and checks the file
byte for byte.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

crates/live/src/live_accept.rs

@@ -1093,12 +1093,26 @@ fn extract_inner_by_attr(text: &str, attr: &str) -> Option<String> {
     None
 }
 
+/// Drop leading and trailing blank lines while keeping a single empty line
+/// when the inner text is only whitespace.
+fn trim_surrounding_blank_lines(lines: Vec<String>) -> Vec<String> {
+    let mut start = 0usize;
+    let mut end = lines.len();
+    while end - start > 1 && trim(&lines[start]).is_empty() {
+        start += 1;
+    }
+    while end - start > 1 && trim(&lines[end - 1]).is_empty() {
+        end -= 1;
+    }
+    lines[start..end].to_vec()
+}
+
 /// JS: extractOriginal(lines, block)
 fn extract_original(lines: &[String], block: &MarkerBlock) -> Vec<String> {
     let text = strip_style_and_join(lines, block);
     match extract_inner_by_attr(&text, "data-impeccable-variant=\"original\"") {
         None => Vec::new(),
-        Some(inner) => inner.split('\n').map(String::from).collect(),
+        Some(inner) => trim_surrounding_blank_lines(inner.split('\n').map(String::from).collect()),
     }
 }
 
@@ -1113,13 +1127,7 @@ fn extract_variant(
         &text,
         &format!("data-impeccable-variant=\"{}\"", variant_num),
     )?;
-    let mut result: Vec<String> = inner.split('\n').map(String::from).collect();
-    while result.len() > 1 && trim(&result[0]).is_empty() {
-        result.remove(0);
-    }
-    while result.len() > 1 && trim(result.last().unwrap()).is_empty() {
-        result.pop();
-    }
+    let result = trim_surrounding_blank_lines(inner.split('\n').map(String::from).collect());
     if result.is_empty() {
         None
     } else {
@@ -1249,6 +1257,55 @@ fn find_session_file(id: &str, cwd: &str) -> Option<(String, String, Vec<String>
     Some((file, content, lines))
 }
 
+#[cfg(test)]
+mod discard_tests {
+    use super::*;
+
+    #[test]
+    fn discard_restores_the_original_without_blank_lines_around_it() {
+        let nanos = std::time::SystemTime::now()
+            .duration_since(std::time::UNIX_EPOCH)
+            .map(|d| d.as_nanos())
+            .unwrap_or(0);
+        let dir = std::env::temp_dir().join(format!(
+            "impeccable-discard-{}-{nanos}",
+            std::process::id()
+        ));
+        let _ = std::fs::remove_dir_all(&dir);
+        std::fs::create_dir_all(&dir).unwrap();
+        let file = dir.join("Login.tsx");
+        let src = [
+            "      </div>",
+            "      <div data-impeccable-variants=\"ab12cd34\" data-impeccable-variant-count=\"3\" style={{ display: \"contents\" }}>",
+            "        {/* impeccable-variants-start ab12cd34 */}",
+            "        <style data-impeccable-css=\"ab12cd34\">{`",
+            "          @scope ([data-impeccable-variant=\"1\"]) { :scope > .x { color: red; } }",
+            "        `}</style>",
+            "        {/* Original */}",
+            "        <div data-impeccable-variant=\"original\">",
+            "          <Bar title=\"Log in\" />",
+            "        </div>",
+            "        {/* Variants: insert below this line */}",
+            "        <div data-impeccable-variant=\"1\">",
+            "          <Bar title=\"Log in\" />",
+            "        </div>",
+            "        {/* impeccable-variants-end ab12cd34 */}",
+            "      </div>",
+            "    </AuthPage>",
+        ];
+        let lines: Vec<String> = src.iter().map(|s| s.to_string()).collect();
+        let path = file.to_string_lossy().into_owned();
+        std::fs::write(&file, lines.join("\n")).unwrap();
+        handle_discard_unlocked("ab12cd34", &lines, &path).unwrap();
+        let out = std::fs::read_to_string(&file).unwrap();
+        let _ = std::fs::remove_dir_all(&dir);
+        assert_eq!(
+            out,
+            "      </div>\n      <Bar title=\"Log in\" />\n    </AuthPage>"
+        );
+    }
+}
+
 #[cfg(test)]
 mod bake_tests {
     use super::*;