Bug 1752253: Change era skeleton to "GGG" to produce the expected era field length. r=platform-i18n-reviewers,gregtatum

This is actually exploiting an ICU bug, but ensures we return the same results
as other browsers. When the ICU bug has been fixed, we can revert this back to
"G".

Differential Revision: https://phabricator.services.mozilla.com/D156413

This is the simplest approach I could think of to allow the welcome screen to
revert back to any theme the user had installed initially. The reason this
wasn't working previously is just that the surface could only retrieve built-in
addon IDs. If we reserve a property for an active non-built-in theme, then the
behavior will be the same for built-in themes and user-installed themes.

Differential Revision: https://phabricator.services.mozilla.com/D155769

Differential Revision: https://phabricator.services.mozilla.com/D155462

Differential Revision: https://phabricator.services.mozilla.com/D156711

* Initial import of function-references test
* Disable tests via spec-tests.patch and config.toml

Differential Revision: https://phabricator.services.mozilla.com/D155098

Add initFromRootedLocation method to set Val type. Fixes crashes of asserts connected with testing non-nullable reference globals -- it is impossible to construct Val with non-defaultable type

Differential Revision: https://phabricator.services.mozilla.com/D155097

- Update wast to 46.0.0
- Fix names.wast warning
- Process only non-excluded tests

Differential Revision: https://phabricator.services.mozilla.com/D155096

The test is performed inside browser_promise_userInteractionHandling.js

Differential Revision: https://phabricator.services.mozilla.com/D156639

Differential Revision: https://phabricator.services.mozilla.com/D156479

Differential Revision: https://phabricator.services.mozilla.com/D156703

Bug 1786147 - Remove layout.css.webkit-line-clamp.enabled, and add a new pref to apply line-clamp to all BFCs. r=dholbert

It's always true, so remove it.

Add another pref to allow -webkit-line-clamp to work on all blocks
rather than just legacy -webkit-boxes, which seems something we should
try to look into, eventually.

Depends on D155181

Differential Revision: https://phabricator.services.mozilla.com/D155182

Bug 1786147 - Make -webkit-line-clamp create a block container in the appropriate situations. r=dholbert

This is a hack, sorta, similar to Chromium's:

  https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/layout/layout_object.cc;l=356;drc=312b74e385e6aba98ab31fd911238c0dc16b396c

except at computed-value rather than used-value time, because it's both
simpler to reason about and prevents lying in the computed style.

This fixes the relevant test-case, and matches closer what Chromium does,
by not creating anonymous flex items for all elements inside the
line-clamp context.

The behavior change is covered by the test changes. I had to also fix a
couple pre-existing bugs that were caught by tests, now that the
line-clamped block is the -webkit-box-styled element rather than an anonymous
flex item (and thus now had padding).

Depends on D155180

Differential Revision: https://phabricator.services.mozilla.com/D155181

Differential Revision: https://phabricator.services.mozilla.com/D156723

Differential Revision: https://phabricator.services.mozilla.com/D156569

We don't use it because we don't use theme-color, but some sites are
starting to rely on it (comment 4) and it is trivial to support.

Differential Revision: https://phabricator.services.mozilla.com/D156667

Bug 1776653 Part 2: Prevent concurrent font creation between Font Loader and main thread on macOS. r=jrmuizel

This is a very broad lock on all the activity of LoadFontFamilyData. If we
wanted to narrow it for performance reasons, we may only need to protect
the calls to CTFontCreateWithFontDescriptor, but those happen within a
loop so the  overhead of holding and releasing the lock repeatedly could
also be a performance hit.

Differential Revision: https://phabricator.services.mozilla.com/D155107

Differential Revision: https://phabricator.services.mozilla.com/D156672

Backed out 2 changesets (bug 1780912) for causing failures in browser_aboutdebugging_addons_debug_console.js CLOSED TREE

Backed out changeset d2360a2a3d70 (bug 1780912)
Backed out changeset 21f1e9031be0 (bug 1780912)

Differential Revision: https://phabricator.services.mozilla.com/D156628

Depends on D156523

Differential Revision: https://phabricator.services.mozilla.com/D156524

Differential Revision: https://phabricator.services.mozilla.com/D156523

This allows to keep the DevTools visible while interacting with the Firefox
window where the extension is running.

This behavior is enabled by default, but can be disable on-demand via a button
in the top toolbar.
Note that it requires to close and reopen the window/toolbox as platform APIs
disallow changing this behavior "live" on a given window.

Differential Revision: https://phabricator.services.mozilla.com/D155843

This should hopefully help debug addons displaying panels/popups.

Differential Revision: https://phabricator.services.mozilla.com/D155393

As of rustc 1.64, Box::from_raw is #[must_use].

Differential Revision: https://phabricator.services.mozilla.com/D156599

As of rustc 1.64, Box::from_raw is #[must_use].

Differential Revision: https://phabricator.services.mozilla.com/D156617

Differential Revision: https://phabricator.services.mozilla.com/D156681

Differential Revision: https://phabricator.services.mozilla.com/D156726

Differential Revision: https://phabricator.services.mozilla.com/D156670

Differential Revision: https://phabricator.services.mozilla.com/D156569

Differential Revision: https://phabricator.services.mozilla.com/D156659

Differential Revision: https://phabricator.services.mozilla.com/D155493

Differential Revision: https://phabricator.services.mozilla.com/D156724

Differential Revision: https://phabricator.services.mozilla.com/D156687

Differential Revision: https://phabricator.services.mozilla.com/D156618

Backed out changeset ba320f40c889 (bug 1706179) for causing wpt failures on reflection-metadata.html . CLOSED TREE

Backed out 3 changesets (bug 1787561) for causing mochitest failures on browser_tab_visibility_and_play_time.js

Backed out changeset a41ab0c5f32f (bug 1787561)
Backed out changeset c1375f03dc75 (bug 1787561)
Backed out changeset afef5857aea6 (bug 1787561)