Slight progress on new_breadcrumbs_section.

src/renderer/breadcrumb_tree.rs

@@ -18,6 +18,16 @@ pub enum BreadcrumbTreeNodeElement<'a> {
 }
 
 impl<'a> BreadcrumbTreeNode<'a> {
+    pub fn new(
+        parent: Option<&'a dyn BreadcrumbTree>,
+        element: BreadcrumbTreeNodeElement<'a>,
+    ) -> Self {
+        BreadcrumbTreeNode {
+            parent: parent,
+            element: element,
+        }
+    }
+
     pub fn ice_iter(&'a self) -> impl Iterator<Item = &dyn IntoContextElement> {
         self.breadcrumb_iter().map(|b| b.get_ice())
     }