Reimplement Debug for layout nodes

src/layout/background.rs

@@ -1,6 +1,7 @@
 use super::*;
 
 /// A node that places a rectangular filled background behind its child.
+#[derive(Debug)]
 #[cfg_attr(feature = "layout-cache", derive(Hash))]
 pub struct BackgroundNode {
     /// The kind of shape to use as a background.

src/layout/fixed.rs

@@ -3,6 +3,7 @@ use decorum::N64;
 use super::*;
 
 /// A node that can fix its child's width and height.
+#[derive(Debug)]
 #[cfg_attr(feature = "layout-cache", derive(Hash))]
 pub struct FixedNode {
     /// The fixed width, if any.

src/layout/grid.rs

@@ -1,6 +1,7 @@
 use super::*;
 
 /// A node that arranges its children in a grid.
+#[derive(Debug)]
 #[cfg_attr(feature = "layout-cache", derive(Hash))]
 pub struct GridNode {
     /// The inline (columns) and block (rows) directions of this grid.

src/layout/image.rs

@@ -4,6 +4,7 @@ use crate::image::ImageId;
 use ::image::GenericImageView;
 
 /// An image node.
+#[derive(Debug)]
 #[cfg_attr(feature = "layout-cache", derive(Hash))]
 pub struct ImageNode {
     /// The id of the image file.

src/layout/mod.rs

@@ -30,6 +30,7 @@ pub use shaping::*;
 pub use stack::*;
 pub use tree::*;
 
+use std::fmt::Debug;
 use std::rc::Rc;
 
 use crate::font::FontStore;
@@ -73,7 +74,7 @@ impl<'a> LayoutContext<'a> {
 }
 
 /// Layout a node.
-pub trait Layout {
+pub trait Layout: Debug {
     /// Layout the node into the given regions.
     fn layout(
         &self,

src/layout/pad.rs

@@ -1,6 +1,7 @@
 use super::*;
 
 /// A node that adds padding to its child.
+#[derive(Debug)]
 #[cfg_attr(feature = "layout-cache", derive(Hash))]
 pub struct PadNode {
     /// The amount of padding.

src/layout/par.rs

@@ -10,6 +10,7 @@ use crate::util::{EcoString, RangeExt, SliceExt};
 type Range = std::ops::Range<usize>;
 
 /// A node that arranges its children into a paragraph.
+#[derive(Debug)]
 #[cfg_attr(feature = "layout-cache", derive(Hash))]
 pub struct ParNode {
     /// The inline direction of this paragraph.
@@ -21,6 +22,7 @@ pub struct ParNode {
 }
 
 /// A child of a paragraph node.
+#[derive(Debug)]
 #[cfg_attr(feature = "layout-cache", derive(Hash))]
 pub enum ParChild {
     /// Spacing between other nodes.

src/layout/stack.rs

@@ -1,6 +1,7 @@
 use super::*;
 
 /// A node that stacks its children.
+#[derive(Debug)]
 #[cfg_attr(feature = "layout-cache", derive(Hash))]
 pub struct StackNode {
     /// The inline and block directions of this stack.
@@ -13,6 +14,7 @@ pub struct StackNode {
 }
 
 /// A child of a stack node.
+#[derive(Debug)]
 #[cfg_attr(feature = "layout-cache", derive(Hash))]
 pub enum StackChild {
     /// Spacing between other nodes.

src/layout/tree.rs

@@ -1,3 +1,5 @@
+use std::fmt::{self, Debug, Formatter};
+
 use super::*;
 
 use std::any::Any;
@@ -9,6 +11,7 @@ use std::hash::{Hash, Hasher};
 use fxhash::FxHasher64;
 
 /// A tree of layout nodes.
+#[derive(Debug)]
 pub struct LayoutTree {
     /// Runs of pages with the same properties.
     pub runs: Vec<PageRun>,
@@ -22,6 +25,7 @@ impl LayoutTree {
 }
 
 /// A run of pages that all have the same properties.
+#[derive(Debug)]
 pub struct PageRun {
     /// The size of each page.
     pub size: Size,
@@ -95,6 +99,12 @@ impl Layout for LayoutNode {
     }
 }
 
+impl Debug for LayoutNode {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        self.node.fmt(f)
+    }
+}
+
 #[cfg(feature = "layout-cache")]
 impl Hash for LayoutNode {
     fn hash<H: Hasher>(&self, state: &mut H) {