Implement filter for file-type input's accept attribute
Now the two sides are pasted together with the new version of `mime_guess` landed.
I tested this thing locally with stuff like this:
```html
<input id="input_file" type="file" accept=".doc,.docx,.xml,application/msword,application/vnd.openxmlformats-officedocument.wordprocessingml.document"></input>
<a onclick="open_file();">Click</a>
<script type="text/javascript">
function open_file() {
console.log("Open file");
document.getElementById("input_file").click();
}
</script>
```
Will WPT be able to handle this automatically?
---
<!-- 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 is related to #11131
<!-- Either: -->
- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____
<!-- 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="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/11757)
<!-- Reviewable:end -->
Use *const AtomicUsize rather than *mut AtomicUsize in WorkQueue.
Atomics use internal mutability, so this *mut is at best confusing.
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/11797)
<!-- Reviewable:end -->
Account for the font of empty input fields
The font of empty fragments is not accounted for in layout. This behavior is incorrect when part of an input field.
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix#11653
- [X] There are tests for these changes
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/11798)
<!-- Reviewable:end -->
Add pkg-config dep for ArchLinux
<!-- Please describe your changes on the following line: -->
Add pkg-config to readme.
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [ ] `./mach build -d` does not report any errors
- [ ] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).
<!-- Either: -->
- [ ] There are tests for these changes OR
- [X] These changes do not require tests because this is an edit to the readme.
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
Without this package, I get this error:
```
Compiling servo-freetype-sys v2.4.11
Build failed, waiting for other jobs to finish...
error: failed to run custom build command for `dbus v0.3.3`
Process didn't exit successfully: `/dsk/src/servo/target/release/build/dbus-7f7af798babde0c1/build-script-build` (exit code: 101)
--- stderr
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: "Failed to run `\"pkg-config\" \"--libs\" \"--cflags\" \"dbus-1\"`: No such file or directory (os error 2)"', ../src/libcore/result.rs:785
note: Run with `RUST_BACKTRACE=1` for a backtrace.
[Warning] Could not generate notification! Optional Python module 'dbus' is not installed.
Build completed in 0:05:27
```
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/11795)
<!-- Reviewable:end -->
Silent some warnings
- [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 only silent some warnings
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/11788)
<!-- Reviewable:end -->
Enable history interface tests
This is needed for #10992.
<!-- 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 enabling the history interface tests.
<!-- 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="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/11793)
<!-- Reviewable:end -->
