Implement rejectionhandled event
---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix#22006 .
- [x] There are more tests `PASS`ed for these changes
<!-- 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/22149)
<!-- Reviewable:end -->
Package and release the Servo magicleap app
<!-- Please describe your changes on the following line: -->
Package the Magic Leap Servo2D app, and build and release it nightly.
---
<!-- 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 do not require tests because we don't test ML
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
<!-- 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/22180)
<!-- Reviewable:end -->
Taskcluster: add dev build and unit tests on macOS
For simplicity, Salt is used in [agentless](https://docs.saltstack.com/en/getstarted/ssh/) mode for now.
I’m also hoping to have most of the dependencies be installed by tasks for themselves, so that changes can be made in the same `servo/servo` PR that uses them without redeploying servers.
<!-- 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/22185)
<!-- Reviewable:end -->
Remove android emulator tests from buildbot CI.
This works around #22187 on CI, since I have not been able to figure out what changed yet. I can reproduce the problem locally, so I can keep poking at it without holding up all the other work going on.
<!-- 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/22201)
<!-- Reviewable:end -->
I moved away from the `Window` struct all the logic to handle task
sources, into a new struct called `TaskManager`. In a happy world, I'd
be able to just have there two functions, of the types:
```rust
fn task_source<T: TaskSource>(&self, name: TaskSourceName) -> Box<T>
fn task_source_with_canceller<T: TaskSource>(&self, name: TaskSourceName)
-> (Box<T>, TaskSourceCanceller)
```
And not so much duplicated code. However, because TaskSource can't be a
trait object (because it has generic type parameters), that's not
possible. Instead, I decided to reduce duplicated logic through macros.
For reasons[1], I have to pass both the name of the function with
canceller and the name of the function without, as I'm not able to
concatenate them in the macro itself. I could probably use
`concat_idents` to create both types already defined and reduce the
amount of arguments by one, but that macro is nightly only. At the same
time, not being able to declare macros inside `impl` forces me to pass
`self` as an argument.
All this makes this solution more verbose than it would be ideally. It
does reduce duplication, but it doesn't reduce the size of the file.
[1](https://github.com/rust-lang/rust/issues/29599)
Use keyboard-types::webdriver::send_keys
This improves the quality of KeyboardEvents sent by WebDriver. Now key, code, location and modifiers are set according to spec. CompositionEvents are discarded as servo does not handle them at all.
CompositionEvent support can be added later.
Is there a good way to automatically test this?
<!-- 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/22173)
<!-- Reviewable:end -->
Add gstreamer and gstreamer-vaapi to Arch Linux dependencies
Running `./mach build --dev` on Arch Linux fails with error messages about missing gstreamer.
<!-- 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/22166)
<!-- Reviewable:end -->
This improves the quality of KeyboardEvents
sent by WebDriver. Now key, code, location and
modifiers are set according to spec.
CompositionEvents are discarded as servo
does not handle them at all.
Fix wrong spec link in align specified value
---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes do not require tests because it just fixes wrong spec link.
<!-- 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/22172)
<!-- Reviewable:end -->
