Remove unused function Rope::is_leaf()

core/src/text_buffer/rope/mod.rs

@@ -225,14 +225,6 @@ impl Rope {
         }
     }
 
-    /// Returns true if this node is a leaf node, false otherwise
-    pub fn is_leaf(&self) -> bool {
-        match &self {
-            Rope::Branch { .. } => false,
-            Rope::Leaf { .. } => true,
-        }
-    }
-
     /// Returns an iterator over the chars of the text
     pub fn iter_chars(self: &Rc<Self>) -> CharIterator {
         CharIterator::new(self)