Switch the majority of fxhash uses to rustc_hash which is maintained (#39168)

fxhash seems to be unmaintained (see
https://github.com/rustsec/advisory-db/issues/2185) so we should move
away from it.
Additionally, the new crate might be slightly faster.

There is still some cases depending on stylo that have the old fxhash
crate.

Signed-off-by: Narfinger <Narfinger@users.noreply.github.com>

Testing: Changes in Hash should really not show any bugs. And
performance should be comparable.

Signed-off-by: Narfinger <Narfinger@users.noreply.github.com>

Cargo.lock

@@ -4873,6 +4873,7 @@ dependencies = [
  "quickcheck",
  "range",
  "rayon",
+ "rustc-hash 2.1.1",
  "script",
  "script_traits",
  "selectors",
@@ -4910,7 +4911,6 @@ dependencies = [
  "fnv",
  "fonts",
  "fonts_traits",
- "fxhash",
  "html5ever",
  "ipc-channel",
  "libc",
@@ -4920,6 +4920,7 @@ dependencies = [
  "pixels",
  "profile_traits",
  "range",
+ "rustc-hash 2.1.1",
  "script_traits",
  "selectors",
  "serde",
@@ -7376,6 +7377,7 @@ dependencies = [
  "profile_traits",
  "range",
  "regex",
+ "rustc-hash 2.1.1",
  "script_bindings",
  "script_traits",
  "selectors",

Cargo.toml

@@ -126,6 +126,7 @@ resvg = "0.45.0"
 rustls = { version = "0.23", default-features = false, features = ["logging", "std", "tls12"] }
 rustls-pemfile = "2.0"
 rustls-pki-types = "1.12"
+rustc-hash = "2.1.1"
 script_traits = { path = "components/shared/script" }
 selectors = { git = "https://github.com/servo/stylo", branch = "2025-09-02" }
 serde = "1.0.219"

components/layout/Cargo.toml

@@ -46,6 +46,7 @@ pixels = { path = "../pixels" }
 profile_traits = { workspace = true }
 range = { path = "../range" }
 rayon = { workspace = true }
+rustc-hash = { workspace = true }
 script = { path = "../script" }
 script_traits = { workspace = true }
 selectors = { workspace = true }

components/layout/context.rs

@@ -8,7 +8,6 @@ use embedder_traits::UntrustedNodeAddress;
 use euclid::Size2D;
 use fnv::FnvHashMap;
 use fonts::FontContext;
-use fxhash::FxHashMap;
 use layout_api::wrapper_traits::ThreadSafeLayoutNode;
 use layout_api::{
     IFrameSizes, ImageAnimationState, PendingImage, PendingImageState, PendingRasterizationImage,
@@ -19,6 +18,7 @@ use net_traits::image_cache::{
 };
 use parking_lot::{Mutex, RwLock};
 use pixels::RasterImage;
+use rustc_hash::FxHashMap;
 use script::layout_dom::ServoThreadSafeLayoutNode;
 use servo_url::{ImmutableOrigin, ServoUrl};
 use style::context::SharedStyleContext;

components/layout/fragment_tree/fragment_tree.rs

@@ -7,8 +7,8 @@ use std::cell::Cell;
 use app_units::Au;
 use base::print_tree::PrintTree;
 use compositing_traits::display_list::AxesScrollSensitivity;
-use fxhash::FxHashSet;
 use malloc_size_of_derive::MallocSizeOf;
+use rustc_hash::FxHashSet;
 use style::animation::AnimationSetKey;
 use style::computed_values::position::T as Position;
 

components/script/Cargo.toml

@@ -100,6 +100,7 @@ parking_lot = { workspace = true }
 percent-encoding = { workspace = true }
 phf = "0.11"
 pixels = { path = "../pixels" }
+rustc-hash = { workspace = true }
 profile_traits = { workspace = true }
 range = { path = "../range" }
 regex = { workspace = true }

components/script/image_animation.rs

@@ -8,12 +8,12 @@ use std::time::Duration;
 
 use compositing_traits::{ImageUpdate, SerializableImageData};
 use embedder_traits::UntrustedNodeAddress;
-use fxhash::FxHashMap;
 use ipc_channel::ipc::IpcSharedMemory;
 use layout_api::ImageAnimationState;
 use libc::c_void;
 use malloc_size_of::MallocSizeOf;
 use parking_lot::RwLock;
+use rustc_hash::FxHashMap;
 use script_bindings::codegen::GenericBindings::WindowBinding::WindowMethods;
 use script_bindings::root::Dom;
 use style::dom::OpaqueNode;

components/shared/layout/Cargo.toml

@@ -23,7 +23,6 @@ euclid = { workspace = true }
 fnv = { workspace = true }
 fonts = { path = "../../fonts" }
 fonts_traits = { workspace = true }
-fxhash = { workspace = true }
 html5ever = { workspace = true }
 ipc-channel = { workspace = true }
 libc = { workspace = true }
@@ -33,6 +32,7 @@ net_traits = { workspace = true }
 parking_lot = { workspace = true }
 pixels = { path = "../../pixels" }
 profile_traits = { workspace = true }
+rustc-hash = { workspace = true }
 range = { path = "../../range" }
 script_traits = { workspace = true }
 selectors = { workspace = true }

components/shared/layout/lib.rs

@@ -30,7 +30,6 @@ use euclid::Point2D;
 use euclid::default::{Point2D as UntypedPoint2D, Rect};
 use fnv::FnvHashMap;
 use fonts::{FontContext, SystemFontServiceProxy};
-use fxhash::FxHashMap;
 pub use layout_damage::LayoutDamage;
 use libc::c_void;
 use malloc_size_of::{MallocSizeOf as MallocSizeOfTrait, MallocSizeOfOps, malloc_size_of_is_0};
@@ -40,6 +39,7 @@ use parking_lot::RwLock;
 use pixels::RasterImage;
 use profile_traits::mem::Report;
 use profile_traits::time;
+use rustc_hash::FxHashMap;
 use script_traits::{InitialScriptState, Painter, ScriptThreadMessage};
 use serde::{Deserialize, Serialize};
 use servo_arc::Arc as ServoArc;