fix(scope): no new string allocation to count characters

src/commit/types/scope.rs

@@ -61,7 +61,11 @@ impl Scope {
 
     /// Returns the visible length of the header segment
     pub fn header_segment_len(&self) -> usize {
-        self.header_segment().chars().count()
+        if self.is_empty() {
+            0
+        } else {
+            self.0.chars().count() + 2
+        }
     }
 }