Auto merge of #12757 - emilio:stylo, r=bholley,pcwalton

stylo: Stop restyling display: none elements, remove the has_changed hack that made us use ReconstructFrame unconditionally.

<!-- Please describe your changes on the following line: -->

---
<!-- 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

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

r? @bholley

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/12757)
<!-- Reviewable:end -->

1 files changed, 1 insertions, 1 deletions

diff --git a/components/layout/animation.rs b/components/layout/animation.rs
index 5222d4ba70a..71a388dcf0c 100644
--- a/components/layout/animation.rs
+++ b/components/layout/animation.rs
@@ -135,7 +135,7 @@ pub fn recalc_style_for_animations(context: &SharedLayoutContext,
                 update_style_for_animation(&context.style_context,
                                            animation,
                                            &mut fragment.style);
-                damage |= RestyleDamage::compute(Some(&old_style), &fragment.style);
+                damage |= RestyleDamage::compute(&old_style, &fragment.style);
             }
         }
     });