Only look at added lines in mentions type="content"

src/handlers/mentions.rs

@@ -80,7 +80,7 @@ pub(super) async fn parse_input(
                         // Only mentions byte-for-byte matching content inside the patch.
                         files
                             .iter()
-                            .filter(|f| patch_contains(&f.patch, &**entry))
+                            .filter(|f| patch_adds(&f.patch, &**entry))
                             .map(|f| PathBuf::from(&f.filename))
                             .collect()
                     }
@@ -157,11 +157,9 @@ pub(super) async fn handle_input(
     Ok(())
 }
 
-fn patch_contains(patch: &str, needle: &str) -> bool {
+fn patch_adds(patch: &str, needle: &str) -> bool {
     for line in patch.lines() {
-        if (!line.starts_with("+++") && line.starts_with('+'))
-            || (!line.starts_with("---") && line.starts_with('-'))
-        {
+        if !line.starts_with("+++") && line.starts_with('+') {
             if line.contains(needle) {
                 return true;
             }
@@ -183,18 +181,29 @@ mod tests {
 +hello world
  context line
 ";
-        assert!(patch_contains(patch, "hello"));
+        assert!(patch_adds(patch, "hello"));
     }
 
     #[test]
-    fn finds_removed_line() {
+    fn finds_added_line_in_modified() {
+        let patch = "\
+--- a/file.txt
++++ b/file.txt
+-hello
++hello world
+";
+        assert!(patch_adds(patch, "hello"));
+    }
+
+    #[test]
+    fn ignore_removed_line() {
         let patch = "\
 --- a/file.txt
 +++ b/file.txt
 -old value
 +new value
 ";
-        assert!(patch_contains(patch, "old value"));
+        assert!(!patch_adds(patch, "old value"));
     }
 
     #[test]
@@ -204,7 +213,7 @@ mod tests {
 +++ b/file.txt
  context line
 ";
-        assert!(!patch_contains(patch, "file.txt")); // should *not* match header
+        assert!(!patch_adds(patch, "file.txt")); // should *not* match header
     }
 
     #[test]
@@ -214,6 +223,6 @@ mod tests {
 +++ b/file.txt
 +added line
 ";
-        assert!(!patch_contains(patch, "missing"));
+        assert!(!patch_adds(patch, "missing"));
     }
 }