Add a live Rust style editor to inspector to edit a sequence of no-argument style modifiers (#31443)

Editing JSON styles is not very helpful for bringing style changes back
to the actual code. This PR adds a buffer that pretends to be Rust,
applying any style attribute identifiers it finds. Also supports
completions with display of documentation. The effect of the currently
selected completion is previewed. Warning diagnostics appear on any
unrecognized identifier.


https://github.com/user-attachments/assets/af39ff0a-26a5-4835-a052-d8f642b2080c

Adds a `#[derive_inspector_reflection]` macro which allows these methods
to be enumerated and called by their name. The macro code changes were
95% generated by Zed Agent + Opus 4.

Release Notes:

* Added an element inspector for development. On debug builds,
`dev::ToggleInspector` will open a pane allowing inspecting of element
info and modifying styles.

crates/gpui/src/bounds_tree.rs

@@ -8,7 +8,7 @@ use std::{
 #[derive(Debug)]
 pub(crate) struct BoundsTree<U>
 where
-    U: Default + Clone + Debug,
+    U: Clone + Debug + Default + PartialEq,
 {
     root: Option<usize>,
     nodes: Vec<Node<U>>,
@@ -17,7 +17,14 @@ where
 
 impl<U> BoundsTree<U>
 where
-    U: Clone + Debug + PartialOrd + Add<U, Output = U> + Sub<Output = U> + Half + Default,
+    U: Clone
+        + Debug
+        + PartialEq
+        + PartialOrd
+        + Add<U, Output = U>
+        + Sub<Output = U>
+        + Half
+        + Default,
 {
     pub fn clear(&mut self) {
         self.root = None;
@@ -174,7 +181,7 @@ where
 
 impl<U> Default for BoundsTree<U>
 where
-    U: Default + Clone + Debug,
+    U: Clone + Debug + Default + PartialEq,
 {
     fn default() -> Self {
         BoundsTree {
@@ -188,7 +195,7 @@ where
 #[derive(Debug, Clone)]
 enum Node<U>
 where
-    U: Clone + Default + Debug,
+    U: Clone + Debug + Default + PartialEq,
 {
     Leaf {
         bounds: Bounds<U>,
@@ -204,7 +211,7 @@ where
 
 impl<U> Node<U>
 where
-    U: Clone + Default + Debug,
+    U: Clone + Debug + Default + PartialEq,
 {
     fn bounds(&self) -> &Bounds<U> {
         match self {

crates/gpui/src/geometry.rs

@@ -76,9 +76,9 @@ pub trait Along {
     JsonSchema,
     Hash,
 )]
-#[refineable(Debug, Serialize, Deserialize, JsonSchema)]
+#[refineable(Debug, PartialEq, Serialize, Deserialize, JsonSchema)]
 #[repr(C)]
-pub struct Point<T: Default + Clone + Debug> {
+pub struct Point<T: Clone + Debug + Default + PartialEq> {
     /// The x coordinate of the point.
     pub x: T,
     /// The y coordinate of the point.
@@ -104,11 +104,11 @@ pub struct Point<T: Default + Clone + Debug> {
 /// assert_eq!(p.x, 10);
 /// assert_eq!(p.y, 20);
 /// ```
-pub const fn point<T: Clone + Debug + Default>(x: T, y: T) -> Point<T> {
+pub const fn point<T: Clone + Debug + Default + PartialEq>(x: T, y: T) -> Point<T> {
     Point { x, y }
 }
 
-impl<T: Clone + Debug + Default> Point<T> {
+impl<T: Clone + Debug + Default + PartialEq> Point<T> {
     /// Creates a new `Point` with the specified `x` and `y` coordinates.
     ///
     /// # Arguments
@@ -145,7 +145,7 @@ impl<T: Clone + Debug + Default> Point<T> {
     /// let p_float = p.map(|coord| coord as f32);
     /// assert_eq!(p_float, Point { x: 3.0, y: 4.0 });
     /// ```
-    pub fn map<U: Clone + Default + Debug>(&self, f: impl Fn(T) -> U) -> Point<U> {
+    pub fn map<U: Clone + Debug + Default + PartialEq>(&self, f: impl Fn(T) -> U) -> Point<U> {
         Point {
             x: f(self.x.clone()),
             y: f(self.y.clone()),
@@ -153,7 +153,7 @@ impl<T: Clone + Debug + Default> Point<T> {
     }
 }
 
-impl<T: Clone + Debug + Default> Along for Point<T> {
+impl<T: Clone + Debug + Default + PartialEq> Along for Point<T> {
     type Unit = T;
 
     fn along(&self, axis: Axis) -> T {
@@ -177,7 +177,7 @@ impl<T: Clone + Debug + Default> Along for Point<T> {
     }
 }
 
-impl<T: Clone + Debug + Default + Negate> Negate for Point<T> {
+impl<T: Clone + Debug + Default + PartialEq + Negate> Negate for Point<T> {
     fn negate(self) -> Self {
         self.map(Negate::negate)
     }
@@ -222,7 +222,7 @@ impl Point<Pixels> {
 
 impl<T> Point<T>
 where
-    T: Sub<T, Output = T> + Debug + Clone + Default,
+    T: Sub<T, Output = T> + Clone + Debug + Default + PartialEq,
 {
     /// Get the position of this point, relative to the given origin
     pub fn relative_to(&self, origin: &Point<T>) -> Point<T> {
@@ -235,7 +235,7 @@ where
 
 impl<T, Rhs> Mul<Rhs> for Point<T>
 where
-    T: Mul<Rhs, Output = T> + Clone + Default + Debug,
+    T: Mul<Rhs, Output = T> + Clone + Debug + Default + PartialEq,
     Rhs: Clone + Debug,
 {
     type Output = Point<T>;
@@ -250,7 +250,7 @@ where
 
 impl<T, S> MulAssign<S> for Point<T>
 where
-    T: Clone + Mul<S, Output = T> + Default + Debug,
+    T: Mul<S, Output = T> + Clone + Debug + Default + PartialEq,
     S: Clone,
 {
     fn mul_assign(&mut self, rhs: S) {
@@ -261,7 +261,7 @@ where
 
 impl<T, S> Div<S> for Point<T>
 where
-    T: Div<S, Output = T> + Clone + Default + Debug,
+    T: Div<S, Output = T> + Clone + Debug + Default + PartialEq,
     S: Clone,
 {
     type Output = Self;
@@ -276,7 +276,7 @@ where
 
 impl<T> Point<T>
 where
-    T: PartialOrd + Clone + Default + Debug,
+    T: PartialOrd + Clone + Debug + Default + PartialEq,
 {
     /// Returns a new point with the maximum values of each dimension from `self` and `other`.
     ///
@@ -369,7 +369,7 @@ where
     }
 }
 
-impl<T: Clone + Default + Debug> Clone for Point<T> {
+impl<T: Clone + Debug + Default + PartialEq> Clone for Point<T> {
     fn clone(&self) -> Self {
         Self {
             x: self.x.clone(),
@@ -378,7 +378,7 @@ impl<T: Clone + Default + Debug> Clone for Point<T> {
     }
 }
 
-impl<T: Default + Clone + Debug + Display> Display for Point<T> {
+impl<T: Clone + Debug + Default + PartialEq + Display> Display for Point<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "({}, {})", self.x, self.y)
     }
@@ -389,16 +389,16 @@ impl<T: Default + Clone + Debug + Display> Display for Point<T> {
 /// This struct is generic over the type `T`, which can be any type that implements `Clone`, `Default`, and `Debug`.
 /// It is commonly used to specify dimensions for elements in a UI, such as a window or element.
 #[derive(Refineable, Default, Clone, Copy, PartialEq, Div, Hash, Serialize, Deserialize)]
-#[refineable(Debug, Serialize, Deserialize, JsonSchema)]
+#[refineable(Debug, PartialEq, Serialize, Deserialize, JsonSchema)]
 #[repr(C)]
-pub struct Size<T: Clone + Default + Debug> {
+pub struct Size<T: Clone + Debug + Default + PartialEq> {
     /// The width component of the size.
     pub width: T,
     /// The height component of the size.
     pub height: T,
 }
 
-impl<T: Clone + Default + Debug> Size<T> {
+impl<T: Clone + Debug + Default + PartialEq> Size<T> {
     /// Create a new Size, a synonym for [`size`]
     pub fn new(width: T, height: T) -> Self {
         size(width, height)
@@ -422,14 +422,14 @@ impl<T: Clone + Default + Debug> Size<T> {
 /// ```
 pub const fn size<T>(width: T, height: T) -> Size<T>
 where
-    T: Clone + Default + Debug,
+    T: Clone + Debug + Default + PartialEq,
 {
     Size { width, height }
 }
 
 impl<T> Size<T>
 where
-    T: Clone + Default + Debug,
+    T: Clone + Debug + Default + PartialEq,
 {
     /// Applies a function to the width and height of the size, producing a new `Size<U>`.
     ///
@@ -451,7 +451,7 @@ where
     /// ```
     pub fn map<U>(&self, f: impl Fn(T) -> U) -> Size<U>
     where
-        U: Clone + Default + Debug,
+        U: Clone + Debug + Default + PartialEq,
     {
         Size {
             width: f(self.width.clone()),
@@ -462,7 +462,7 @@ where
 
 impl<T> Size<T>
 where
-    T: Clone + Default + Debug + Half,
+    T: Clone + Debug + Default + PartialEq + Half,
 {
     /// Compute the center point of the size.g
     pub fn center(&self) -> Point<T> {
@@ -502,7 +502,7 @@ impl Size<Pixels> {
 
 impl<T> Along for Size<T>
 where
-    T: Clone + Default + Debug,
+    T: Clone + Debug + Default + PartialEq,
 {
     type Unit = T;
 
@@ -530,7 +530,7 @@ where
 
 impl<T> Size<T>
 where
-    T: PartialOrd + Clone + Default + Debug,
+    T: PartialOrd + Clone + Debug + Default + PartialEq,
 {
     /// Returns a new `Size` with the maximum width and height from `self` and `other`.
     ///
@@ -595,7 +595,7 @@ where
 
 impl<T> Sub for Size<T>
 where
-    T: Sub<Output = T> + Clone + Default + Debug,
+    T: Sub<Output = T> + Clone + Debug + Default + PartialEq,
 {
     type Output = Size<T>;
 
@@ -609,7 +609,7 @@ where
 
 impl<T> Add for Size<T>
 where
-    T: Add<Output = T> + Clone + Default + Debug,
+    T: Add<Output = T> + Clone + Debug + Default + PartialEq,
 {
     type Output = Size<T>;
 
@@ -623,8 +623,8 @@ where
 
 impl<T, Rhs> Mul<Rhs> for Size<T>
 where
-    T: Mul<Rhs, Output = Rhs> + Clone + Default + Debug,
-    Rhs: Clone + Default + Debug,
+    T: Mul<Rhs, Output = Rhs> + Clone + Debug + Default + PartialEq,
+    Rhs: Clone + Debug + Default + PartialEq,
 {
     type Output = Size<Rhs>;
 
@@ -638,7 +638,7 @@ where
 
 impl<T, S> MulAssign<S> for Size<T>
 where
-    T: Mul<S, Output = T> + Clone + Default + Debug,
+    T: Mul<S, Output = T> + Clone + Debug + Default + PartialEq,
     S: Clone,
 {
     fn mul_assign(&mut self, rhs: S) {
@@ -647,24 +647,24 @@ where
     }
 }
 
-impl<T> Eq for Size<T> where T: Eq + Default + Debug + Clone {}
+impl<T> Eq for Size<T> where T: Eq + Clone + Debug + Default + PartialEq {}
 
 impl<T> Debug for Size<T>
 where
-    T: Clone + Default + Debug,
+    T: Clone + Debug + Default + PartialEq,
 {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(f, "Size {{ {:?} × {:?} }}", self.width, self.height)
     }
 }
 
-impl<T: Default + Clone + Debug + Display> Display for Size<T> {
+impl<T: Clone + Debug + Default + PartialEq + Display> Display for Size<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "{} × {}", self.width, self.height)
     }
 }
 
-impl<T: Clone + Default + Debug> From<Point<T>> for Size<T> {
+impl<T: Clone + Debug + Default + PartialEq> From<Point<T>> for Size<T> {
     fn from(point: Point<T>) -> Self {
         Self {
             width: point.x,
@@ -746,7 +746,7 @@ impl Size<Length> {
 #[derive(Refineable, Clone, Default, Debug, Eq, PartialEq, Serialize, Deserialize, Hash)]
 #[refineable(Debug)]
 #[repr(C)]
-pub struct Bounds<T: Clone + Default + Debug> {
+pub struct Bounds<T: Clone + Debug + Default + PartialEq> {
     /// The origin point of this area.
     pub origin: Point<T>,
     /// The size of the rectangle.
@@ -754,7 +754,10 @@ pub struct Bounds<T: Clone + Default + Debug> {
 }
 
 /// Create a bounds with the given origin and size
-pub fn bounds<T: Clone + Default + Debug>(origin: Point<T>, size: Size<T>) -> Bounds<T> {
+pub fn bounds<T: Clone + Debug + Default + PartialEq>(
+    origin: Point<T>,
+    size: Size<T>,
+) -> Bounds<T> {
     Bounds { origin, size }
 }
 
@@ -790,7 +793,7 @@ impl Bounds<Pixels> {
 
 impl<T> Bounds<T>
 where
-    T: Clone + Debug + Default,
+    T: Clone + Debug + Default + PartialEq,
 {
     /// Creates a new `Bounds` with the specified origin and size.
     ///
@@ -809,7 +812,7 @@ where
 
 impl<T> Bounds<T>
 where
-    T: Clone + Debug + Sub<Output = T> + Default,
+    T: Sub<Output = T> + Clone + Debug + Default + PartialEq,
 {
     /// Constructs a `Bounds` from two corner points: the top left and bottom right corners.
     ///
@@ -875,7 +878,7 @@ where
 
 impl<T> Bounds<T>
 where
-    T: Clone + Debug + Sub<T, Output = T> + Default + Half,
+    T: Sub<T, Output = T> + Half + Clone + Debug + Default + PartialEq,
 {
     /// Creates a new bounds centered at the given point.
     pub fn centered_at(center: Point<T>, size: Size<T>) -> Self {
@@ -889,7 +892,7 @@ where
 
 impl<T> Bounds<T>
 where
-    T: Clone + Debug + PartialOrd + Add<T, Output = T> + Default,
+    T: PartialOrd + Add<T, Output = T> + Clone + Debug + Default + PartialEq,
 {
     /// Checks if this `Bounds` intersects with another `Bounds`.
     ///
@@ -937,7 +940,7 @@ where
 
 impl<T> Bounds<T>
 where
-    T: Clone + Debug + Add<T, Output = T> + Default + Half,
+    T: Add<T, Output = T> + Half + Clone + Debug + Default + PartialEq,
 {
     /// Returns the center point of the bounds.
     ///
@@ -970,7 +973,7 @@ where
 
 impl<T> Bounds<T>
 where
-    T: Clone + Debug + Add<T, Output = T> + Default,
+    T: Add<T, Output = T> + Clone + Debug + Default + PartialEq,
 {
     /// Calculates the half perimeter of a rectangle defined by the bounds.
     ///
@@ -997,7 +1000,7 @@ where
 
 impl<T> Bounds<T>
 where
-    T: Clone + Debug + Add<T, Output = T> + Sub<Output = T> + Default,
+    T: Add<T, Output = T> + Sub<Output = T> + Clone + Debug + Default + PartialEq,
 {
     /// Dilates the bounds by a specified amount in all directions.
     ///
@@ -1048,7 +1051,13 @@ where
 
 impl<T> Bounds<T>
 where
-    T: Clone + Debug + Add<T, Output = T> + Sub<T, Output = T> + Neg<Output = T> + Default,
+    T: Add<T, Output = T>
+        + Sub<T, Output = T>
+        + Neg<Output = T>
+        + Clone
+        + Debug
+        + Default
+        + PartialEq,
 {
     /// Inset the bounds by a specified amount. Equivalent to `dilate` with the amount negated.
     ///
@@ -1058,7 +1067,9 @@ where
     }
 }
 
-impl<T: Clone + Default + Debug + PartialOrd + Add<T, Output = T> + Sub<Output = T>> Bounds<T> {
+impl<T: PartialOrd + Add<T, Output = T> + Sub<Output = T> + Clone + Debug + Default + PartialEq>
+    Bounds<T>
+{
     /// Calculates the intersection of two `Bounds` objects.
     ///
     /// This method computes the overlapping region of two `Bounds`. If the bounds do not intersect,
@@ -1140,7 +1151,7 @@ impl<T: Clone + Default + Debug + PartialOrd + Add<T, Output = T> + Sub<Output =
 
 impl<T> Bounds<T>
 where
-    T: Clone + Debug + Add<T, Output = T> + Sub<T, Output = T> + Default,
+    T: Add<T, Output = T> + Sub<T, Output = T> + Clone + Debug + Default + PartialEq,
 {
     /// Computes the space available within outer bounds.
     pub fn space_within(&self, outer: &Self) -> Edges<T> {
@@ -1155,9 +1166,9 @@ where
 
 impl<T, Rhs> Mul<Rhs> for Bounds<T>
 where
-    T: Mul<Rhs, Output = Rhs> + Clone + Default + Debug,
+    T: Mul<Rhs, Output = Rhs> + Clone + Debug + Default + PartialEq,
     Point<T>: Mul<Rhs, Output = Point<Rhs>>,
-    Rhs: Clone + Default + Debug,
+    Rhs: Clone + Debug + Default + PartialEq,
 {
     type Output = Bounds<Rhs>;
 
@@ -1171,7 +1182,7 @@ where
 
 impl<T, S> MulAssign<S> for Bounds<T>
 where
-    T: Mul<S, Output = T> + Clone + Default + Debug,
+    T: Mul<S, Output = T> + Clone + Debug + Default + PartialEq,
     S: Clone,
 {
     fn mul_assign(&mut self, rhs: S) {
@@ -1183,7 +1194,7 @@ where
 impl<T, S> Div<S> for Bounds<T>
 where
     Size<T>: Div<S, Output = Size<T>>,
-    T: Div<S, Output = T> + Default + Clone + Debug,
+    T: Div<S, Output = T> + Clone + Debug + Default + PartialEq,
     S: Clone,
 {
     type Output = Self;
@@ -1198,7 +1209,7 @@ where
 
 impl<T> Add<Point<T>> for Bounds<T>
 where
-    T: Add<T, Output = T> + Default + Clone + Debug,
+    T: Add<T, Output = T> + Clone + Debug + Default + PartialEq,
 {
     type Output = Self;
 
@@ -1212,7 +1223,7 @@ where
 
 impl<T> Sub<Point<T>> for Bounds<T>
 where
-    T: Sub<T, Output = T> + Default + Clone + Debug,
+    T: Sub<T, Output = T> + Clone + Debug + Default + PartialEq,
 {
     type Output = Self;
 
@@ -1226,7 +1237,7 @@ where
 
 impl<T> Bounds<T>
 where
-    T: Add<T, Output = T> + Clone + Default + Debug,
+    T: Add<T, Output = T> + Clone + Debug + Default + PartialEq,
 {
     /// Returns the top edge of the bounds.
     ///
@@ -1365,7 +1376,7 @@ where
 
 impl<T> Bounds<T>
 where
-    T: Add<T, Output = T> + PartialOrd + Clone + Default + Debug,
+    T: Add<T, Output = T> + PartialOrd + Clone + Debug + Default + PartialEq,
 {
     /// Checks if the given point is within the bounds.
     ///
@@ -1472,7 +1483,7 @@ where
     /// ```
     pub fn map<U>(&self, f: impl Fn(T) -> U) -> Bounds<U>
     where
-        U: Clone + Default + Debug,
+        U: Clone + Debug + Default + PartialEq,
     {
         Bounds {
             origin: self.origin.map(&f),
@@ -1531,7 +1542,7 @@ where
 
 impl<T> Bounds<T>
 where
-    T: Add<T, Output = T> + PartialOrd + Clone + Default + Debug + Sub<T, Output = T>,
+    T: Add<T, Output = T> + Sub<T, Output = T> + PartialOrd + Clone + Debug + Default + PartialEq,
 {
     /// Convert a point to the coordinate space defined by this Bounds
     pub fn localize(&self, point: &Point<T>) -> Option<Point<T>> {
@@ -1545,7 +1556,7 @@ where
 /// # Returns
 ///
 /// Returns `true` if either the width or the height of the bounds is less than or equal to zero, indicating an empty area.
-impl<T: PartialOrd + Default + Debug + Clone> Bounds<T> {
+impl<T: PartialOrd + Clone + Debug + Default + PartialEq> Bounds<T> {
     /// Checks if the bounds represent an empty area.
     ///
     /// # Returns
@@ -1556,7 +1567,7 @@ impl<T: PartialOrd + Default + Debug + Clone> Bounds<T> {
     }
 }
 
-impl<T: Default + Clone + Debug + Display + Add<T, Output = T>> Display for Bounds<T> {
+impl<T: Clone + Debug + Default + PartialEq + Display + Add<T, Output = T>> Display for Bounds<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(
             f,
@@ -1651,7 +1662,7 @@ impl Bounds<DevicePixels> {
     }
 }
 
-impl<T: Clone + Debug + Copy + Default> Copy for Bounds<T> {}
+impl<T: Copy + Clone + Debug + Default + PartialEq> Copy for Bounds<T> {}
 
 /// Represents the edges of a box in a 2D space, such as padding or margin.
 ///
@@ -1674,9 +1685,9 @@ impl<T: Clone + Debug + Copy + Default> Copy for Bounds<T> {}
 /// assert_eq!(edges.left, 40.0);
 /// ```
 #[derive(Refineable, Clone, Default, Debug, Eq, PartialEq)]
-#[refineable(Debug, Serialize, Deserialize, JsonSchema)]
+#[refineable(Debug, PartialEq, Serialize, Deserialize, JsonSchema)]
 #[repr(C)]
-pub struct Edges<T: Clone + Default + Debug> {
+pub struct Edges<T: Clone + Debug + Default + PartialEq> {
     /// The size of the top edge.
     pub top: T,
     /// The size of the right edge.
@@ -1689,7 +1700,7 @@ pub struct Edges<T: Clone + Default + Debug> {
 
 impl<T> Mul for Edges<T>
 where
-    T: Mul<Output = T> + Clone + Default + Debug,
+    T: Mul<Output = T> + Clone + Debug + Default + PartialEq,
 {
     type Output = Self;
 
@@ -1705,7 +1716,7 @@ where
 
 impl<T, S> MulAssign<S> for Edges<T>
 where
-    T: Mul<S, Output = T> + Clone + Default + Debug,
+    T: Mul<S, Output = T> + Clone + Debug + Default + PartialEq,
     S: Clone,
 {
     fn mul_assign(&mut self, rhs: S) {
@@ -1716,9 +1727,9 @@ where
     }
 }
 
-impl<T: Clone + Default + Debug + Copy> Copy for Edges<T> {}
+impl<T: Clone + Debug + Default + PartialEq + Copy> Copy for Edges<T> {}
 
-impl<T: Clone + Default + Debug> Edges<T> {
+impl<T: Clone + Debug + Default + PartialEq> Edges<T> {
     /// Constructs `Edges` where all sides are set to the same specified value.
     ///
     /// This function creates an `Edges` instance with the `top`, `right`, `bottom`, and `left` fields all initialized
@@ -1776,7 +1787,7 @@ impl<T: Clone + Default + Debug> Edges<T> {
     /// ```
     pub fn map<U>(&self, f: impl Fn(&T) -> U) -> Edges<U>
     where
-        U: Clone + Default + Debug,
+        U: Clone + Debug + Default + PartialEq,
     {
         Edges {
             top: f(&self.top),
@@ -2151,9 +2162,9 @@ impl Corner {
 ///
 /// Each field represents the size of the corner on one side of the box: `top_left`, `top_right`, `bottom_right`, and `bottom_left`.
 #[derive(Refineable, Clone, Default, Debug, Eq, PartialEq)]
-#[refineable(Debug, Serialize, Deserialize, JsonSchema)]
+#[refineable(Debug, PartialEq, Serialize, Deserialize, JsonSchema)]
 #[repr(C)]
-pub struct Corners<T: Clone + Default + Debug> {
+pub struct Corners<T: Clone + Debug + Default + PartialEq> {
     /// The value associated with the top left corner.
     pub top_left: T,
     /// The value associated with the top right corner.
@@ -2166,7 +2177,7 @@ pub struct Corners<T: Clone + Default + Debug> {
 
 impl<T> Corners<T>
 where
-    T: Clone + Default + Debug,
+    T: Clone + Debug + Default + PartialEq,
 {
     /// Constructs `Corners` where all sides are set to the same specified value.
     ///
@@ -2319,7 +2330,7 @@ impl Corners<Pixels> {
     }
 }
 
-impl<T: Div<f32, Output = T> + Ord + Clone + Default + Debug> Corners<T> {
+impl<T: Div<f32, Output = T> + Ord + Clone + Debug + Default + PartialEq> Corners<T> {
     /// Clamps corner radii to be less than or equal to half the shortest side of a quad.
     ///
     /// # Arguments
@@ -2340,7 +2351,7 @@ impl<T: Div<f32, Output = T> + Ord + Clone + Default + Debug> Corners<T> {
     }
 }
 
-impl<T: Clone + Default + Debug> Corners<T> {
+impl<T: Clone + Debug + Default + PartialEq> Corners<T> {
     /// Applies a function to each field of the `Corners`, producing a new `Corners<U>`.
     ///
     /// This method allows for converting a `Corners<T>` to a `Corners<U>` by specifying a closure
@@ -2375,7 +2386,7 @@ impl<T: Clone + Default + Debug> Corners<T> {
     /// ```
     pub fn map<U>(&self, f: impl Fn(&T) -> U) -> Corners<U>
     where
-        U: Clone + Default + Debug,
+        U: Clone + Debug + Default + PartialEq,
     {
         Corners {
             top_left: f(&self.top_left),
@@ -2388,7 +2399,7 @@ impl<T: Clone + Default + Debug> Corners<T> {
 
 impl<T> Mul for Corners<T>
 where
-    T: Mul<Output = T> + Clone + Default + Debug,
+    T: Mul<Output = T> + Clone + Debug + Default + PartialEq,
 {
     type Output = Self;
 
@@ -2404,7 +2415,7 @@ where
 
 impl<T, S> MulAssign<S> for Corners<T>
 where
-    T: Mul<S, Output = T> + Clone + Default + Debug,
+    T: Mul<S, Output = T> + Clone + Debug + Default + PartialEq,
     S: Clone,
 {
     fn mul_assign(&mut self, rhs: S) {
@@ -2415,7 +2426,7 @@ where
     }
 }
 
-impl<T> Copy for Corners<T> where T: Copy + Clone + Default + Debug {}
+impl<T> Copy for Corners<T> where T: Copy + Clone + Debug + Default + PartialEq {}
 
 impl From<f32> for Corners<Pixels> {
     fn from(val: f32) -> Self {
@@ -3427,7 +3438,7 @@ impl Default for DefiniteLength {
 }
 
 /// A length that can be defined in pixels, rems, percent of parent, or auto.
-#[derive(Clone, Copy)]
+#[derive(Clone, Copy, PartialEq)]
 pub enum Length {
     /// A definite length specified either in pixels, rems, or as a fraction of the parent's size.
     Definite(DefiniteLength),
@@ -3772,7 +3783,7 @@ impl IsZero for Length {
     }
 }
 
-impl<T: IsZero + Debug + Clone + Default> IsZero for Point<T> {
+impl<T: IsZero + Clone + Debug + Default + PartialEq> IsZero for Point<T> {
     fn is_zero(&self) -> bool {
         self.x.is_zero() && self.y.is_zero()
     }
@@ -3780,14 +3791,14 @@ impl<T: IsZero + Debug + Clone + Default> IsZero for Point<T> {
 
 impl<T> IsZero for Size<T>
 where
-    T: IsZero + Default + Debug + Clone,
+    T: IsZero + Clone + Debug + Default + PartialEq,
 {
     fn is_zero(&self) -> bool {
         self.width.is_zero() || self.height.is_zero()
     }
 }
 
-impl<T: IsZero + Debug + Clone + Default> IsZero for Bounds<T> {
+impl<T: IsZero + Clone + Debug + Default + PartialEq> IsZero for Bounds<T> {
     fn is_zero(&self) -> bool {
         self.size.is_zero()
     }
@@ -3795,7 +3806,7 @@ impl<T: IsZero + Debug + Clone + Default> IsZero for Bounds<T> {
 
 impl<T> IsZero for Corners<T>
 where
-    T: IsZero + Clone + Default + Debug,
+    T: IsZero + Clone + Debug + Default + PartialEq,
 {
     fn is_zero(&self) -> bool {
         self.top_left.is_zero()

crates/gpui/src/inspector.rs

@@ -221,3 +221,34 @@ mod conditional {
         }
     }
 }
+
+/// Provides definitions used by `#[derive_inspector_reflection]`.
+#[cfg(any(feature = "inspector", debug_assertions))]
+pub mod inspector_reflection {
+    use std::any::Any;
+
+    /// Reification of a function that has the signature `fn some_fn(T) -> T`. Provides the name,
+    /// documentation, and ability to invoke the function.
+    #[derive(Clone, Copy)]
+    pub struct FunctionReflection<T> {
+        /// The name of the function
+        pub name: &'static str,
+        /// The method
+        pub function: fn(Box<dyn Any>) -> Box<dyn Any>,
+        /// Documentation for the function
+        pub documentation: Option<&'static str>,
+        /// `PhantomData` for the type of the argument and result
+        pub _type: std::marker::PhantomData<T>,
+    }
+
+    impl<T: 'static> FunctionReflection<T> {
+        /// Invoke this method on a value and return the result.
+        pub fn invoke(&self, value: T) -> T {
+            let boxed = Box::new(value) as Box<dyn Any>;
+            let result = (self.function)(boxed);
+            *result
+                .downcast::<T>()
+                .expect("Type mismatch in reflection invoke")
+        }
+    }
+}

crates/gpui/src/scene.rs

@@ -679,7 +679,7 @@ pub(crate) struct PathId(pub(crate) usize);
 
 /// A line made up of a series of vertices and control points.
 #[derive(Clone, Debug)]
-pub struct Path<P: Clone + Default + Debug> {
+pub struct Path<P: Clone + Debug + Default + PartialEq> {
     pub(crate) id: PathId,
     order: DrawOrder,
     pub(crate) bounds: Bounds<P>,
@@ -812,7 +812,7 @@ impl From<Path<ScaledPixels>> for Primitive {
 
 #[derive(Clone, Debug)]
 #[repr(C)]
-pub(crate) struct PathVertex<P: Clone + Default + Debug> {
+pub(crate) struct PathVertex<P: Clone + Debug + Default + PartialEq> {
     pub(crate) xy_position: Point<P>,
     pub(crate) st_position: Point<f32>,
     pub(crate) content_mask: ContentMask<P>,

crates/gpui/src/style.rs

@@ -140,7 +140,7 @@ impl ObjectFit {
 
 /// The CSS styling that can be applied to an element via the `Styled` trait
 #[derive(Clone, Refineable, Debug)]
-#[refineable(Debug, Serialize, Deserialize, JsonSchema)]
+#[refineable(Debug, PartialEq, Serialize, Deserialize, JsonSchema)]
 pub struct Style {
     /// What layout strategy should be used?
     pub display: Display,
@@ -286,7 +286,7 @@ pub enum Visibility {
 }
 
 /// The possible values of the box-shadow property
-#[derive(Clone, Debug, Serialize, Deserialize, JsonSchema)]
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, JsonSchema)]
 pub struct BoxShadow {
     /// What color should the shadow have?
     pub color: Hsla,
@@ -332,7 +332,7 @@ pub enum TextAlign {
 
 /// The properties that can be used to style text in GPUI
 #[derive(Refineable, Clone, Debug, PartialEq)]
-#[refineable(Debug, Serialize, Deserialize, JsonSchema)]
+#[refineable(Debug, PartialEq, Serialize, Deserialize, JsonSchema)]
 pub struct TextStyle {
     /// The color of the text
     pub color: Hsla,
@@ -794,7 +794,7 @@ pub struct StrikethroughStyle {
 }
 
 /// The kinds of fill that can be applied to a shape.
-#[derive(Clone, Debug, Serialize, Deserialize, JsonSchema)]
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, JsonSchema)]
 pub enum Fill {
     /// A solid color fill.
     Color(Background),

crates/gpui/src/styled.rs

@@ -14,6 +14,10 @@ const ELLIPSIS: SharedString = SharedString::new_static("…");
 
 /// A trait for elements that can be styled.
 /// Use this to opt-in to a utility CSS-like styling API.
+#[cfg_attr(
+    any(feature = "inspector", debug_assertions),
+    gpui_macros::derive_inspector_reflection
+)]
 pub trait Styled: Sized {
     /// Returns a reference to the style memory of this element.
     fn style(&mut self) -> &mut StyleRefinement;

crates/gpui/src/taffy.rs

@@ -359,7 +359,7 @@ impl ToTaffy<taffy::style::LengthPercentage> for AbsoluteLength {
 impl<T, T2> From<TaffyPoint<T>> for Point<T2>
 where
     T: Into<T2>,
-    T2: Clone + Default + Debug,
+    T2: Clone + Debug + Default + PartialEq,
 {
     fn from(point: TaffyPoint<T>) -> Point<T2> {
         Point {
@@ -371,7 +371,7 @@ where
 
 impl<T, T2> From<Point<T>> for TaffyPoint<T2>
 where
-    T: Into<T2> + Clone + Default + Debug,
+    T: Into<T2> + Clone + Debug + Default + PartialEq,
 {
     fn from(val: Point<T>) -> Self {
         TaffyPoint {
@@ -383,7 +383,7 @@ where
 
 impl<T, U> ToTaffy<TaffySize<U>> for Size<T>
 where
-    T: ToTaffy<U> + Clone + Default + Debug,
+    T: ToTaffy<U> + Clone + Debug + Default + PartialEq,
 {
     fn to_taffy(&self, rem_size: Pixels) -> TaffySize<U> {
         TaffySize {
@@ -395,7 +395,7 @@ where
 
 impl<T, U> ToTaffy<TaffyRect<U>> for Edges<T>
 where
-    T: ToTaffy<U> + Clone + Default + Debug,
+    T: ToTaffy<U> + Clone + Debug + Default + PartialEq,
 {
     fn to_taffy(&self, rem_size: Pixels) -> TaffyRect<U> {
         TaffyRect {
@@ -410,7 +410,7 @@ where
 impl<T, U> From<TaffySize<T>> for Size<U>
 where
     T: Into<U>,
-    U: Clone + Default + Debug,
+    U: Clone + Debug + Default + PartialEq,
 {
     fn from(taffy_size: TaffySize<T>) -> Self {
         Size {
@@ -422,7 +422,7 @@ where
 
 impl<T, U> From<Size<T>> for TaffySize<U>
 where
-    T: Into<U> + Clone + Default + Debug,
+    T: Into<U> + Clone + Debug + Default + PartialEq,
 {
     fn from(size: Size<T>) -> Self {
         TaffySize {

crates/gpui/src/window.rs

@@ -979,7 +979,7 @@ pub(crate) struct DispatchEventResult {
 /// to leave room to support more complex shapes in the future.
 #[derive(Clone, Debug, Default, PartialEq, Eq)]
 #[repr(C)]
-pub struct ContentMask<P: Clone + Default + Debug> {
+pub struct ContentMask<P: Clone + Debug + Default + PartialEq> {
     /// The bounds
     pub bounds: Bounds<P>,
 }