Layout 2020: Implement basic white-space: pre support
With these changes `<pre>` and `<br>` preserve spaces and force line breaks appropriately.
---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix#26440
- [x] There are tests for these changes
Fixed usage of wrong delete
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Layout 2020: Implement `clip: rect`
This implements `clip: rect`
Unfortunately, none of the tests pass yet, they are all broken due to https://github.com/servo/servo/issues/27387
Additionally, currently `clip` does not seem to clip the element itself, only its children. I'm not quite sure what to do about that, I patterned this off of the code in the layout 2013 which handled clip immediately after scroll overflow.
Removed unnecessary conversion from UTF-8 to UTF-16
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Changed Spidermonkey API calls to remove need for UTF-16 conversion.
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Make reload button clear the network cache.
The developer workflow in FxR is frustrating right now because of bugs like https://github.com/servo/servo/issues/24385. To allow us to put out a new release soon that addresses this papercut, these changes make the reload button clear the network cache in FxR.
---
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- [x] These changes fix (kind of) #26411.
- [x] These changes do not require tests because can't test FxR.
Move secondary view support into a pref
Needs https://github.com/servo/webxr/pull/188
Adds a `dom.webxr.first_person_observer_view` pref that toggles FPO views.
build(deps): bump loom from 0.3.4 to 0.3.5
Bumps [loom](https://github.com/tokio-rs/loom) from 0.3.4 to 0.3.5.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/tokio-rs/loom/blob/master/CHANGELOG.md">loom's changelog</a>.</em></p>
<blockquote>
<h1>0.3.5 (July 26, 2020)</h1>
<h3>Fixed</h3>
<ul>
<li>An example in the README failing to compile (<a href="https://github-redirect.dependabot.com/tokio-rs/loom/issues/132">#132</a>)</li>
</ul>
<h3>Changed</h3>
<ul>
<li>Updated <code>scoped-tls</code> to 1.0.0 (<a href="https://github-redirect.dependabot.com/tokio-rs/loom/issues/153">#153</a>)</li>
</ul>
<h3>Added</h3>
<ul>
<li><code>Send</code> and <code>Sync</code> impls for <code>JoinHandle</code> (<a href="https://github-redirect.dependabot.com/tokio-rs/loom/issues/145">#145</a>)</li>
<li><code>Default</code> impls for <code>Mutex</code>, <code>RwLock</code>, and <code>Condvar</code> (<a href="https://github-redirect.dependabot.com/tokio-rs/loom/issues/138">#138</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="af4386b028"><code>af4386b</code></a> prepare to release 0.3.5 (<a href="https://github-redirect.dependabot.com/tokio-rs/loom/issues/160">#160</a>)</li>
<li><a href="2632f929d2"><code>2632f92</code></a> update scoped-tls to 1.0.0 (<a href="https://github-redirect.dependabot.com/tokio-rs/loom/issues/153">#153</a>)</li>
<li><a href="dc9e91c0a9"><code>dc9e91c</code></a> Fix compilation error on README.md (<a href="https://github-redirect.dependabot.com/tokio-rs/loom/issues/132">#132</a>)</li>
<li><a href="871ff01288"><code>871ff01</code></a> Implement Default for Mutex, RwLock and Condvar (<a href="https://github-redirect.dependabot.com/tokio-rs/loom/issues/138">#138</a>)</li>
<li><a href="0b092a2e52"><code>0b092a2</code></a> Make JoinHandle Send + Sync (<a href="https://github-redirect.dependabot.com/tokio-rs/loom/issues/145">#145</a>)</li>
<li>See full diff in <a href="https://github.com/tokio-rs/loom/compare/v0.3.4...v0.3.5">compare view</a></li>
</ul>
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Handle `inset: auto` values for absolutely positioned elements
Fixes#27387
This is the same as https://github.com/servo/servo/pull/27397 , but written to share the box offset data instead of bubbling the hoisted box up based on comments from @SimonSapin.
Update user agent strings
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Remove unit test that triggers frequent intermittent failure.
This works around #26895 by removing the test that triggers it. The underlying cause of the failure isn't clear, but it's something to do with the hyper server and doesn't appear to impact the way that Servo's HTTP stack functions. The unit test itself is testing one particular property of the way CORS requests are made with HEAD requests, and that's not a property that is critical functionality if we stop testing it.
