tree nav: rename get_max_depth() to get_height()

nested/src/editors/typeterm/mod.rs

@@ -483,8 +483,8 @@ impl TreeNav for TypeTermEditor {
         self.cur_node.get().get_cursor_warp()
     }
 
-    fn get_max_depth(&self) -> usize {
-        self.cur_node.get().get_max_depth()
+    fn get_height(&self) -> usize {
+        self.cur_node.get().get_height()
     }
 
     fn goby(&mut self, dir: Vector2<isize>) -> TreeNavResult {

nested/src/tree/nav.rs

@@ -59,7 +59,7 @@ pub trait TreeNav {
         TreeCursor::default()
     }
 
-    fn get_max_depth(&self) -> usize {
+    fn get_height(&self) -> usize {
         0
     }
 

nested/src/tree/node.rs

@@ -304,8 +304,12 @@ impl TreeNav for NestedNode {
         }
     }
 
-    fn get_max_depth(&self) -> usize {
-        0
+    fn get_height(&self) -> usize {
+        if let Some(tn) = self.tree_nav.get() {
+            tn.read().unwrap().get_height()
+        } else {
+            0
+        }
     }
 
     fn goby(&mut self, direction: Vector2<isize>) -> TreeNavResult {