Restyle should reflect animations and transitions

When doing a restyle, we should apply animations and transitions to the
new style so that it is reflected in `getComputedStyle()` and the new
style information properly cascades. This is the first part of properly
ticking animations and transitions.

This causes a couple new animations tests failures (along with many new
passes), but we currently don't have support for properly handling
animations after they have completed, so this isn't totally unexpected.

1 files changed, 2 insertions, 1 deletions

diff --git a/components/layout/animation.rs b/components/layout/animation.rs
index 57db0abda42..79a90f397a7 100644
--- a/components/layout/animation.rs
+++ b/components/layout/animation.rs
@@ -15,6 +15,7 @@ use script_traits::UntrustedNodeAddress;
 use script_traits::{
     AnimationState, ConstellationControlMsg, LayoutMsg as ConstellationMsg, TransitionEventType,
 };
+use servo_arc::Arc;
 use style::animation::{
     update_style_for_animation, Animation, ElementAnimationState, PropertyAnimation,
 };
@@ -223,7 +224,7 @@ fn do_recalc_style_for_animations<E>(
             update_style_for_animation::<E>(
                 &context.style_context,
                 animation,
-                &mut fragment.style,
+                Arc::make_mut(&mut fragment.style),
                 &ServoMetricsProvider,
             );
             let difference = RestyleDamage::compute_style_difference(&old_style, &fragment.style);