Auto merge of #28756 - s-maurice:master, r=jdm

add custom debug formatting for display

Signed-off-by: s-maurice <51819025+s-maurice@users.noreply.github.com>

<!-- Please describe your changes on the following line: -->
Implemented `Debug` for `Display` using `debug_struct`.

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #28755 (GitHub issue number if applicable)

<!-- Either: -->
- [ ] There are tests for these changes OR
- [x] These changes do not require tests because it is a debug formatting display change.

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components/style/values/specified/box.rs

@@ -18,7 +18,7 @@ use crate::Atom;
 use cssparser::Parser;
 use num_traits::FromPrimitive;
 use selectors::parser::SelectorParseErrorKind;
-use std::fmt::{self, Write};
+use std::fmt::{self, Debug, Formatter, Write};
 use style_traits::{CssWriter, KeywordsCollectFn, ParseError};
 use style_traits::{SpecifiedValueInfo, StyleParseErrorKind, ToCss};
 
@@ -121,7 +121,6 @@ pub enum DisplayInside {
 #[derive(
     Clone,
     Copy,
-    Debug,
     Eq,
     FromPrimitive,
     Hash,
@@ -657,6 +656,16 @@ impl SpecifiedValueInfo for Display {
     }
 }
 
+impl Debug for Display {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        f.debug_struct("Display")
+            .field("List Item", &self.is_list_item())
+            .field("Inside", &self.inside())
+            .field("Outside", &self.outside())
+            .finish()
+    }
+}
+
 /// A specified value for the `vertical-align` property.
 pub type VerticalAlign = GenericVerticalAlign<LengthPercentage>;